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답안 #25757

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
25757 2017-06-24T05:14:01 Z 서규호(#1081) 전압 (JOI14_voltage) C++14
0 / 100
 63 ms 9596 KB 
#include <bits/stdc++.h>

#define lld long long
#define pp pair<int,int>
#define pb push_back
#define MOD 1000000007
#define left lleft
#define right rright
#define INF 2000000000
#define Linf 1000000000000000000LL
#define next nnext
#define minus mminus

using namespace std;

int N,M;
int color[100002];
bool check[100002];
vector<int> edge[100002];

bool bipartite;
void dfs(int x){
	check[x] = true;
	for(auto &i : edge[x]){
		if(color[i] == color[x]) bipartite = false;
		else color[i] = 3-color[x];
		if(check[i]) continue;
		dfs(i);
	}
}

int main(){
	scanf("%d %d",&N,&M);
	for(int i=1; i<=M; i++){
		int x,y;
		scanf("%d %d",&x,&y);
		edge[x].pb(y);
		edge[y].pb(x);
	}
	int cnt = 0,it;
	for(int i=1; i<=N; i++){
		if(check[i]) continue;
		bipartite = true;
		color[i] = 1;
		dfs(i);
		if(!bipartite){
			it = i;
			cnt++;
		}
	}
	if(cnt >= 2){
		puts("0");
		return 0;
	}else if(cnt == 0){
		printf("%d\n",N);
		return 0;
	}

	return 0;
}

Compilation message

voltage.cpp: In function 'int main()':
voltage.cpp:40:14: warning: variable 'it' set but not used [-Wunused-but-set-variable]
  int cnt = 0,it;
              ^
voltage.cpp:33:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&N,&M);
                      ^
voltage.cpp:36:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&x,&y);
                       ^

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 4852 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 23 ms 8568 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 49 ms 8568 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 63 ms 9596 KB Output isn't correct
2 Halted 0 ms 0 KB -