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I got the RTE.Please help me.I had test the city AA to ZZ. There are 26*26 cities.

#include<iostream>
#include<fstream>
#include<string>
#include<queue>
#include<stack>
using namespace std;
string city_num[700];
int num_total_city;
bool m[700][700],inside,findend=0;
queue<int> q;
stack<string> p ...