Posted Updated  Semprathlon / Simfae Dean ACM-ICPC / Programinga minute read (About 193 words)

BestCoder

Solved Problems To be solved
Numbers Array
Sum

Numbers

没话可说。

Sum

基础一维DP的变异

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/**
 * Nov 28, 2015 8:04:23 PM
 * PrjName: Bc64-02
 * @semprathlon
 */
import java.io.*;
import java.util.*;
public class Main {
    static int[] a,s,f;
    static int fn(int x){
        return (1890*x+143)%10007;
    }
    public static void main(String[] args) throws IOException{
        InputReader in=new InputReader(System.in);
        PrintWriter out=new PrintWriter(System.out);
        while(in.nextLine()!=null){
            int n=in.nextInt();
            a=new int[n+1];
            s=new int[n+1];
            f=new int[n+1];
            for(int i=1;i<=n;i++){
                a[i]=in.nextInt();
                s[i]=s[i-1]+a[i];
            }
            int ans=s[n];
            for(int i=1;i<=n;i++){
                f[i]=Math.max(f[i-1]+fn(a[i]), s[i]);
                ans=Math.max(ans, f[i]+s[n]-s[i]);
            }
            out.println(ans);
        }
        out.flush();
        out.close();
    }

}
Posted Updated  Semprathlon / Simfae Dean Developing / Environment5 minutes read (About 737 words)

Configure OpenCV with Python for Mac

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-- General configuration for OpenCV 3.0.0 =====================================
--   Version control:               unknown
--
--   Platform:
--     Host:                        Darwin 15.0.0 x86_64
--     CMake:                       3.3.2
--     CMake generator:             Unix Makefiles
--     CMake build tool:            /usr/bin/make
--     Configuration:               RELEASE
--
--   C/C++:
--     Built as dynamic libs?:      YES
--     C++ Compiler:                /Library/Developer/CommandLineTools/usr/bin/c++  (ver 7.0.0.7000176)
--     C++ flags (Release):         -fsigned-char -W -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -fno-omit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
--     C++ flags (Debug):           -fsigned-char -W -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -fno-omit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
--     C Compiler:                  /Library/Developer/CommandLineTools/usr/bin/cc
--     C flags (Release):           -fsigned-char -W -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -fno-omit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
--     C flags (Debug):             -fsigned-char -W -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -fdiagnostics-show-option -Wno-long-long -Qunused-arguments -Wno-semicolon-before-method-body -fno-omit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
--     Linker flags (Release):
--     Linker flags (Debug):
--     Precompiled headers:         NO
--     Extra dependencies:          -framework OpenCL -framework Cocoa -framework QTKit -framework QuartzCore -framework AppKit
--     3rdparty dependencies:       libjpeg libwebp libpng libtiff libjasper IlmImf zlib ippicv
--
--   OpenCV modules:
--     To be built:                 hal core flann imgproc ml photo video imgcodecs shape videoio highgui objdetect superres ts features2d calib3d stitching videostab python2
--     Disabled:                    world
--     Disabled by dependency:      -
--     Unavailable:                 cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java python3 viz
--
--   GUI:
--     QT:                          NO
--     Cocoa:                       YES
--     OpenGL support:              NO
--     VTK support:                 NO
--
--   Media I/O:
--     ZLib:                        build (ver 1.2.8)
--     JPEG:                        build (ver 90)
--     WEBP:                        build (ver 0.3.1)
--     PNG:                         build (ver 1.5.12)
--     TIFF:                        build (ver 42 - 4.0.2)
--     JPEG 2000:                   build (ver 1.900.1)
--     OpenEXR:                     build (ver 1.7.1)
--     GDAL:                        NO
--
--   Video I/O:
--     DC1394 1.x:                  NO
--     DC1394 2.x:                  NO
--     FFMPEG:                      NO
--       codec:                     NO
--       format:                    NO
--       util:                      NO
--       swscale:                   NO
--       resample:                  NO
--       gentoo-style:              NO
--     GStreamer:                   NO
--     OpenNI:                      NO
--     OpenNI PrimeSensor Modules:  NO
--     OpenNI2:                     NO
--     PvAPI:                       NO
--     GigEVisionSDK:               NO
--     QuickTime:                   NO
--     QTKit:                       YES
--     V4L/V4L2:                    NO/NO
--     XIMEA:                       NO
--     gPhoto2:                     NO
--
--   Other third-party libraries:
--     Use IPP:                     8.2.1 [8.2.1]
--          at:                     /Users/semprathlon/opencv-3.0.0/3rdparty/ippicv/unpack/ippicv_osx
--     Use IPP Async:               NO
--     Use Eigen:                   NO
--     Use TBB:                     NO
--     Use OpenMP:                  NO
--     Use GCD                      YES
--     Use Concurrency              NO
--     Use C=:                      NO
--     Use pthreads for parallel for:
--                                  NO
--     Use Cuda:                    NO
--     Use OpenCL:                  YES
--
--   OpenCL:
--     Version:                     static
--     libraries:                   -framework OpenCL
--     Use AMDFFT:                  NO
--     Use AMDBLAS:                 NO
--
--   Python 2:
--     Interpreter:                 /usr/bin/python2.7 (ver 2.7.10)
--     Libraries:                   /usr/lib/libpython2.7.dylib (ver 2.7.10)
--     numpy:                       /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include (ver 1.8.0rc1)
--     packages path:               lib/python2.7/site-packages
--
--   Python 3:
--     Interpreter:                 NO
--
--   Python (for build):            /usr/bin/python2.7
--
--   Java:
--     ant:                         NO
--     JNI:                         /System/Library/Frameworks/JavaVM.framework/Headers /System/Library/Frameworks/JavaVM.framework/Headers /System/Library/Frameworks/JavaVM.framework/Headers
--     Java wrappers:               NO
--     Java tests:                  NO
--
--   Matlab:
--     mex:                         NO
--
--   Documentation:
--     Doxygen:                     NO
--     PlantUML:                    NO
--
--   Tests and samples:
--     Tests:                       YES
--     Performance tests:           YES
--     C/C++ Examples:              YES
--
--   Install path:                  /usr/local
--
--   cvconfig.h is in:              /Users/semprathlon/opencv-3.0.0/release
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    BUILD_PYTHON_SUPPORT

Posted Updated  Semprathlon / Simfae Dean Programinga few seconds read (About 105 words)

Java代码编译命令的微小而关键的细节

今天室友问我，为什么javac编译源代码完成后，用java执行就报错Error: Could not find or load main class呢？

我习惯性地认为是环境变量的值不合适（百度上很多解答也类同），但检查后并无问题……

Read more
Posted Updated  Semprathlon / Simfae Dean ACM-ICPC / Programing3 minutes read (About 428 words)

Bestcoder

Solved Problems
Clarke and food
Clarke and five-pointed star

Clarke and food

非常轻易地完成填充。

Clarke and five-pointed star

辛辛苦苦地敲完了又挂了。。。

我这里独立思考得到的结论是：
以五角星的一个顶点为参考点，则该点必在其他四点所构成的四边形之外，且其他四点相对于该点所成的张角之和是确定的；尽管随着所取的四个点的顺序不同会有不同的值，但也仅有三种情况。
可是测样例数据时不知怎的多加了一个待判值，结果WA了 

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/**
 * Nov 14, 2015 7:35:56 PM
 * PrjName: Bc62-02
 * @semprathlon
 */
import java.io.*;
import java.util.*;
public class Main {
    static Point[] pt=new Point[5];
    static PrintWriter out=new PrintWriter(System.out);
    static boolean check1(){
        return  !Point.isPointInRect(pt[0], pt[1], pt[2], pt[3], pt[4])&&
                !Point.isPointInRect(pt[1], pt[2], pt[3], pt[4], pt[0])&&
                !Point.isPointInRect(pt[2], pt[3], pt[4], pt[0], pt[1])&&
                !Point.isPointInRect(pt[3], pt[4], pt[0], pt[1], pt[2])&&
                !Point.isPointInRect(pt[4], pt[0], pt[1], pt[2], pt[3]);
    }
    static boolean check0(Point p,Point a,Point b,Point c,Point d){
        double v1=Math.acos(-1.0)/5.0,v2=v1*2.0,v3=v1*3.0;
        double angle=Vector.angle2(p, a, b)+Vector.angle2(p, b, c)+Vector.angle2(p, c, d);
        angle=Math.abs(angle);
//        out.println(v1+","+v2+","+v3+","+angle);
        return Point.dcmp(angle-v1)==0||Point.dcmp(angle-v2)==0||Point.dcmp(angle-v3)==0;
    }
    static boolean check2(){
        return check0(pt[0], pt[1], pt[2], pt[3], pt[4])&&
                check0(pt[1], pt[2], pt[3], pt[4], pt[0])&&
                check0(pt[2], pt[3], pt[4], pt[0], pt[1])&&
                check0(pt[3], pt[4], pt[0], pt[1], pt[2])&&
                check0(pt[4], pt[0], pt[1], pt[2], pt[3]);
    }
    public static void main(String[] args) throws IOException{
        InputReader in=new InputReader(System.in);
        
        int T=in.nextInt();
        while(T-->0){
            for(int i=0;i<5;i++)
                pt[i]=new Point(in.nextDouble(), in.nextDouble());
            if (pt[0].equals(pt[1])&&pt[1].equals(pt[2])&&pt[2].equals(pt[3])&&pt[3].equals(pt[4])&&pt[4].equals(pt[0])){
                out.println("Yes");continue;
            }
            out.println(check2()?"Yes":"No");
        }
        out.flush();
        out.close();
    }
}
Posted Updated  Semprathlon / Simfae Dean ACM-ICPC / Programing3 minutes read (About 436 words)

Bestcoder

Solved Problems
Numbers
Game
Subtrees

Numbers

可能需要两个特判？

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/**
 * Oct 31, 2015 7:01:33 PM
 * PrjName: Bc61-01
 * @semprathlon
 */
import java.io.*;
import java.util.*;
public class Main {
    static int maxl=1001;
    static int[] f=new int[maxl];
    static Vector<Integer> v=new Vector<Integer>();
    public static void main(String[] args) throws IOException{
        InputReader in=new InputReader(System.in);
        PrintWriter out=new PrintWriter(System.out);
        while(in.nextLine()!=null){
            int n=in.nextInt();
//            if (n<1) continue;
            boolean has1=false,has2=false,has=false;;
            Arrays.fill(f, 0);
            for(int i=1;i<=n;i++){
                int k=in.nextInt();
                f[k]++;
                if (f[k]>1&&k>0) has1=true;
                if (f[k]>2) has2=true;
            }
            v.clear();
            for(int i=0;i<maxl;i++)
                if (f[i]>0)
                    v.add(i);
//            for(Integer e:v.toArray(new Integer[0]))
//                out.print(e+" ");
            if (v.get(0)==0&&has1||has2){
                out.println("YES");continue;
            }
            Integer[] a=v.toArray(new Integer[0]);
            for(int i=0;i<a.length-1;i++)
                if (!has)
                    for(int j=a.length-1;j>i;j--){
                        int k=Arrays.binarySearch(a, a[j]-a[i]);
                        if (k>i&&k<j){
                            has=true;break;
                        }
                            
                    }
            out.println(has?"YES":"NO");
        }
        out.flush();
        out.close();
    }
}

Game

各种分类讨论，但就是要写好最边缘的特判。。。

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/**
 * Oct 31, 2015 7:28:53 PM
 * PrjName: Bc61-02
 * @semprathlon
 */
import java.io.*;
import java.util.*;
public class Main {
    public static void main(String[] args) throws IOException{
        InputReader in=new InputReader(System.in);
        PrintWriter out=new PrintWriter(System.out);
        while(in.nextLine()!=null){
            int n=in.nextInt();
            int s=in.nextInt();
            int t=in.nextInt();
            if (s==t){
                out.println(n>1?-1:0);continue;
            }
            if (t==1){
                if (s==n)
                    out.println(0);
                else if (s==2)
                    out.println(1);
                else 
                    out.println(2);
            }
            else if (t==n){
                if (s==1)
                    out.println(0);
                else if (s==n-1)
                    out.println(1);
                else
                    out.println(2);
            }
            else{
                if (s==t+1||s==t-1||s==1||s==n)
                    out.println(1);
                else 
                    out.println(2);
            }
        }
        out.flush();
        out.close();
    }

}

Subtrees

有些查找行为显然拖慢时间以致TLE。。。
有一个重要优化是从小到大枚举子树大小而不是相反方向；

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/**
 * Nov 7, 2015 10:31:31 PM
 * PrjName: hdu5524-3
 * @semprathlon
 */
import java.io.*;
import java.util.*;
public class Main {
    static int maxn=64;
    static long[] p2;
    static HashSet<Long> st=new HashSet<Long>();
    static PrintWriter out=new PrintWriter(System.out);
    static void solve(long n){
        if (n==0L) return;
        st.add(n);
        if (n==1L) return;
        long f;
        for(f=1L;;f=f<<1|1L)
            if ((f>>1)<=n-1L-f&&(f<<1)>=n-1L-f)
                break;
        solve(f);
        if ((f<<1|1)!=n)
            solve(n-1-f);
    }
    static void init(){
        p2=new long[maxn];
        p2[0]=1L;
        for(int i=1;i<maxn;i++){
            p2[i]=p2[i-1]<<1;
            p2[i-1]--;
        }
    }
    public static void main(String[] args) throws IOException{
        InputReader in=new InputReader(System.in);
        
        init();
        while(in.nextLine()!=null){
            long n=in.nextLong();
            st.clear();solve(n);
            out.println(st.size());
        }
        out.flush();
        out.close();
    }

}
Posted Updated  Semprathlon / Simfae Dean OS2 minutes read (About 242 words)

OS X 下个性化开发环境的搭建

本人的几轮开发环境配置都是在凌乱中完成的，是时候做一整理了。

  • 安装iTerm2
    没什么话好多说。这个终端应用棒棒的，尤其是卷帘般的可随时唤出的Hotkey Window。别忘了Make iTerm2 default Term。
    Screen Shot 2015-11-03 at 22.54.31

  • Homebrew
    Homebrew installs the stuff you need that Apple didn’t.

ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

A package manager with a handy command brew install that works just like apt-get install in Linux.

Snip20151024_2
Snip20151024_4

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