Posted Updated  Semprathlon / Simfae Dean ACM-ICPC / Programing4 minutes read (About 580 words)

BestCoder

Solved Problems
ZYB’s Biology
ZYB’s Game
ZYB’s Premutation

ZYB’s Biology

平淡无奇的匹配

ZYB’s Game

惊异于“最优策略”的选取，最终结果竟与奇偶性挂钩。

ZYB’s Premutation

常规题型，旧题重演，竟然跑偏了。
半年多前的某基础题的逆向问题。
同样用线段树或树状数组解决，关键是实现查找第k大的数、删除第k大的数并维护。也有基于查询数的更抽象高效的解法。
树状数组：

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/**
 * Dec 5, 2015 8:39:53 PM
 * PrjName: 1205-03-2
 * @semprathlon
 */
import java.io.*;
import java.util.*;
public class Main {
    static int[] a,f;
    static BIT tr;
    static HashSet<Integer> st=new HashSet<Integer>();
    static void print(int[] a,PrintWriter out){
        int n=a.length-1;
        for(int i=1;i<=n;i++)
            out.print(a[i]+(i<n?" ":""));
        out.println();
    }
    public static void main(String[] args) throws IOException{
        InputReader in=new InputReader(System.in);
        PrintWriter out=new PrintWriter(System.out);
        int T=in.nextInt();
//        tr=new BIT(5);
//        out.print(tr.lowbit(2));
        while(T-->0){
            int n=in.nextInt();
            a=new int[n+1];
            f=new int[n+1];
            tr=new BIT(n);
            for(int i=1;i<=n;i++){
                f[i]=in.nextInt();
                tr.add(i, 1);
            }
            
            for(int i=n;i>=1;i--){
                f[i]-=f[i-1];
                int tmp=tr.find(i-f[i]-1);
//                out.println(i+","+f[i]+","+tmp);
                a[i]=tmp;
                tr.add(tmp, -1);
            }
            print(a, out);
        }
        out.flush();
        out.close();
    }
}
class BIT{
    int[] data;
    int sz;
    BIT(){}
    BIT(int _sz){
        sz=_sz;
        data=new int[sz+1];
    }
    int lowbit(int x){
        return x&(-x);
    }
    void add(int p,int v){
        while(p<=sz){
            data[p]+=v;
            p+=lowbit(p);
        }
    }
    int sum(int p){
        int res=0;
        while(p>0){
            res+=data[p];
            p-=lowbit(p);
        }
        return res;
    }
    int find(int p){
        int l=1,r=sz;
        while(l<r){
            int mid=(l+r)>>1;
            if (sum(mid)<=p)
                l=mid+1;
            else
                r=mid;
        }
        
        return l;
    }
}

线段树：

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/**
 * Dec 6, 2015 4:42:31 PM
 * PrjName: 1205-03-3
 * @semprathlon
 */
import java.io.*;
import java.util.*;
public class Main {
    static int[] a,f;
    static ST tr;
    static HashSet<Integer> st=new HashSet<Integer>();
    static void print(int[] a,PrintWriter out){
        int n=a.length-1;
        for(int i=1;i<=n;i++)
            out.print(a[i]+(i<n?" ":""));
        out.println();
    }
    public static void main(String[] args) throws IOException{
        InputReader in=new InputReader(System.in);
        PrintWriter out=new PrintWriter(System.out);
        int T=in.nextInt();
        while(T-->0){
            int n=in.nextInt();
            a=new int[n+1];
            f=new int[n+1];
            tr=new ST(n);
            tr.build(1, 1, n);
            for(int i=1;i<=n;i++)
                f[i]=in.nextInt();
            
            for(int i=n;i>=1;i--){
                f[i]-=f[i-1];
                int tmp=tr.query(1, 1, n, f[i]+1);
//                out.println(i+","+f[i]+","+tmp);
                a[i]=tmp;
                
            }
            print(a, out);
        }
        out.flush();
        out.close();
    }
}
class ST{
    int[] l,r,m,v;
    int sz;
    ST(){}
    ST(int _sz){
        sz=_sz<<2;
        l=new int[sz];
        r=new int[sz];
        m=new int[sz];
        v=new int[sz];
    }
    void build(int k,int x,int y){
        l[k]=x;r[k]=y;m[k]=(x+y)>>1;
        if (x<y){
            build(k<<1,x,m[k]);
            build(k<<1|1,m[k]+1,y);
        }
        v[k]=y-x+1;
    }
    int query(int k,int x,int y,int q){
        if (l[k]==r[k]){
            v[k]=0;
            return l[k];
        }
        int res=0;
        if (v[k<<1|1]>=q)
            res=query(k<<1|1, m[k]+1, y, q);
        else
            res=query(k<<1,x,m[k],q-v[k<<1|1]);
        v[k]=v[k<<1]+v[k<<1|1];
        return res;
    }
    
}
Posted Updated  Semprathlon / Simfae Dean ACM-ICPC / Programinga few seconds read (About 55 words)

EC-final赛前一周

为信仰充值，与神犇赛码！年度最终决战，剑不出鞘更待何时？下周末双日，12.12～13，2015 ACM/ICPC EC-final 上海大学站，蓄势待发！全力备战

wpid-screenshot_2015-12-05-21-55-28.png wpid-230c7f4a3a36cc1f.jpg wpid-351324c2c7cdabb1.jpg wpid-screenshot_2015-12-05-21-55-05.png

wpid-screenshot_2015-12-05-22-02-33.png wpid-img_20151205_220342.jpg

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();
    }
}
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