#include<stdio.h>
#include<algorithm>
#include<vector>
using namespace std;
vector<int>E[100010];
int n, num[100001], cnt, par[100010], res;
bool chk[100010];
void DFS(int a){
num[a] = ++cnt;
int i, x, c = 0;
for (i = 0; i < E[a].size(); i++){
if (num[E[a][i]]){
if (E[a][i] != par[a] && num[E[a][i]] < num[a]){
x = a;
while (x != E[a][i]){
chk[x] = true;
x = par[x];
}
}
continue;
}
par[E[a][i]] = a;
DFS(E[a][i]);
if (!chk[E[a][i]])c++;
}
res += c / 2;
if (c % 2 == 1 && !chk[a]){
chk[a] = true;
res++;
}
}
int main()
{
int i, m, a, b;
scanf("%d%d", &n, &m);
while (m--){
scanf("%d%d", &a, &b);
E[a].push_back(b);
E[b].push_back(a);
}
DFS(1);
printf("%d\n", res);
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
0 ms |
4428 KB |
Output is correct |
2 |
Correct |
0 ms |
4428 KB |
Output is correct |
3 |
Correct |
0 ms |
4428 KB |
Output is correct |
4 |
Correct |
0 ms |
4428 KB |
Output is correct |
5 |
Correct |
0 ms |
4428 KB |
Output is correct |
6 |
Incorrect |
4 ms |
4560 KB |
Output isn't correct |
7 |
Halted |
0 ms |
0 KB |
- |