对拍代码为什么会找不到文件啊？

#include<stdio.h>
#include<cstdlib>
#include<ctime>
#include<iostream>
using namespace std;
int main(){
	for(int T=1;T<=10;T++){
		system("C:\\px.exe");
		double a=clock();
		system("C:\\pxx.exe");
		a=clock();
		system("C:\\pai.exe");
		double b=clock();
		if(system("fc C:\\pxx.ans C:\\pxx.out")){
			cout<<"Wrong Answer!"<<endl;
		}
		else{
			printf("Accepted  question #%d,used %.0lfms\n",T,b);
		}
		system("pause");
	}
}