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对拍

:again
duipai > in.txt
a < in.txt > out.txt
b < in.txt > std.txt
fc out.txt std.txt
if not errorlevel 1 goto again
pause

输入输出优化 upd 20181027

void read(int &x){
    char c=getchar();x=0;int f=1;
    while(!isdigit(c)) f&=(c!='-'),c=getchar();
    while(isdigit(c)) x=(x<<3)+(x<<1)+(c^48),c=getchar();
    x=f?x:-x;
}int wt[50];
inline void output(int x){
    if(!x) {putchar(48); return ;}
    if(x<0) putchar('-'),x=-x; int l=0;
    while(x) wt[++l]=x%10,x/=10;
    while(l) putchar(wt[l--]+48);
}