a290. 新手訓練系列 ~ 圖論 -- 新手訓練系列 ~ 3 | From: [140.116.187.234] | 發表日期 : 2014-07-30 12:06

#include<iostream>

#include<vector>

using namespace std;

struct rd

{

int node1, node2;

};

int main()

{

long long int n, m,i,a,b;

rd c;

vector<rd>node;

while (cin >> n >> m)

{

//node.clear();

for (i = 0; i < m; i++)

{

cin >> c.node1 >> c.node2;

node.push_back(c);

}

cin >> a >> b;

int t = 0;

for (i = 0; i < m; i++)

{

if (node[i].node1 == a &&node[i].node2 == b)

t = 1;

}

if (t == 1)

cout << "Yes!!!\n";

else

cout << "No!!!\n";

}

return 0;