> 试试这个我写的SJ，再看看我的输出。
> 
> #include <iostream>
> #include <algorithm>
> #include <fstream>
> #include <cstdlib>
> using namespace std;
> 
> const char* msgNo1 = "Invalid Number";
> 
> int mat[6][6] = {0}, deg[6] = {0};
> int ans;
> bool mark[6] = {0};
> 
> void travel(int v0)
> {
> 	mark[v0] = true;
> 	for(int i = 0; i < 6; ++i)
> 		if(!mark[i] && mat[v0][i])
> 			travel(i);
> }
> 
> ifstream fout;
> 
> void err(const char* msg)
> {
> 	cout << "Wrong Answer: " << msg << endl;
> 	fout.close();
> 	exit(0);
> }
> 
> int main(int argc, char* argv[])
> {
> 	if(argc != 4)
> 	{
> 		cout << endl << "Usage: check infile outfile ansfile" << endl << endl;
> 		return 0;
> 	}
> 	int i, j, k;
> 	
> 	ifstream fans(argv[3]);
> 	fans >> ans;
> 	fans.close();
> 	ifstream fin(argv[1]);
> 	for(fin >> k; k--;)
> 	{
> 		fin >> i >> j;
> 		--i;
> 		--j;
> 		++mat[i][j];
> 		++mat[j][i];
> 		++deg[i];
> 		++deg[j];
> 	}
> 	fin.close();
> 
> 	fout.open(argv[2]);
> 	if(!(fout >> k)) err(msgNo1);
> 	if(k != ans) err("Wrong Total Cost");
> 	if(!(fout >> k)) err(msgNo1);
> 	int sum = 0;
> 	while(k--)
> 	{
> 		if(!(fout >> i >> j)) err(msgNo1);
> 		if(i < 1 || i > 6 || j < 1 || j > 6) err("Domino Number Out of Range");
> 		sum += i + j;
> 		--i;
> 		--j;
> 		++mat[i][j];
> 		++mat[j][i];
> 		++deg[i];
> 		++deg[j];
> 	}
> 	if(sum != ans) err("Total Arc's Cost Not Equals to the Cost You Give");
> 	for(i = 0, j = 0; i < 6; ++i)
> 		j += deg[i] & 1;
> 	if(j > 2) err("No Link Exist, Too Much Odd Points");
> 	for(i = 0; i < 6 && !deg[i]; ++i);
> 	if(i < 6)
> 	{
> 		travel(i);
> 		for(; i < 6 && (!deg[i] || mark[i]); ++i);
> 	}
> 	if(i < 6) err("Graph Not Connected");
>         char ch;
>         if(fout >> ch) err("Some More Information after the Output File");
> 	
> 	fout.close();
> 	cout << "Accepted!" << endl;
> 	
> 	return 0;
> }