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#ifndef __linux__
#include<windows.h>
#endif
//#include<cstdlib>
//#include<sys/types.h>
//#include<unistd.h>
#include<dirent.h>
#include<string>
#include<vector>
#include<cstring>
#include<algorithm>
using namespace std;
string f=__FILE__;
int n,l;
typedef std::pair<int,string> p;
vector<p>v;
char s[1000];
inline char*rread(int&r,char*s) {
    r=0;
    while(*s<'0'||*s>'9')s--;
    for(int b=1; *s>='0'&&*s<='9'; b*=10,s--)
        r+=b*(*s-'0');
    return s;
}
#include<iostream>
int main() {
    f=f.substr(0,f.find_last_of('.',f.length()));
#ifdef __linux__
    DIR*dir=opendir(("../../data/"+f).c_str());
    dirent*ptr;
    while((ptr=readdir(dir))!=NULL)
        if((l=strlen(ptr->d_name))>3&&
                (string(ptr->d_name).rfind(".out",l)==l-4||
                 string(ptr->d_name).rfind(".ans",l)==l-4)) {
            rread(n,ptr->d_name+strlen(ptr->d_name));
            v.push_back(p(n,string(ptr->d_name)));
        }
    realpath(".",s);
#else
    f=f.substr(f.find_last_of('\\',f.length())+1,f.length());
    WIN32_FIND_DATA d;
    HANDLE hFind=FindFirstFile(("..\\..\\data\\"+f+"\\*").c_str(), &d);
    do if((l=strlen(d.cFileName))>3&&
                (string(d.cFileName).rfind(".out",l)==l-4||
                 string(d.cFileName).rfind(".ans",l)==l-4)) {
            rread(n,d.cFileName+strlen(d.cFileName));
            v.push_back(p(n,string(d.cFileName)));
        }
    while (FindNextFile(hFind, &d) != 0);
    FindClose(hFind);
    GetModuleFileName(NULL,s,1000);
#endif
    rread(n,rread(l,s+strlen(s)));
    sort(v.begin(),v.end());
#ifdef __linux__
    system(("cp -f ../../data/"+f+'/'+v[n].second+" "+f+".out").c_str());
#else
    system(("copy ..\\..\\data\\"+f+'\\'+v[n].second+" "+f+".out").c_str());
#endif
    return 0;
}

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原文地址：https://www.cnblogs.com/Liuz8848/p/11624779.html