提交后显示89分，差第四个数据点，但下载后在Dev-C++运行时输出与标准答案相同，都是输出72，这是怎么回事

#include<bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};
char c[15][15];
int ls, lt, ans;
pii s, t;
bool vis[160005];
bool chk(int x, int y){
	return x >= 1 && x <= 10 && y >= 1 && y <= 10 && c[x][y] != '*'; 
}
int main(){
	for(int i = 1; i <= 10; i++)
		for(int j = 1; j <= 10; j++){
			cin >> c[i][j];
			if(c[i][j] == 'C') t = {i, j};
			if(c[i][j] == 'F') s = {i, j};
		}
	while(s != t){
		ans++;
		if(chk(s.first + dx[ls], s.second + dy[ls])) 
			s = {s.first + dx[ls], s.second + dy[ls]};
		else ls = (ls + 1) % 4;
		if(chk(t.first + dx[lt], t.second + dy[lt])) 
			t = {t.first + dx[lt], t.second + dy[lt]};
		else lt = (lt + 1) % 4;	
		if(s == t){
			printf("%d\n", ans);
			return 0;
		}
		int tmp = s.first + s.second * 10 + t.first * 100 + t.second * 1000 + ls * 10000 + lt * 40000;
        if(vis[tmp]){
            printf("0");
            return 0;
        }
        vis[tmp] = 1;
	}		 
	return 0;
}