Submission #51969

#	Time	Username	Problem	Language	Result	Execution time	Memory
51969		pzdba	Duathlon (APIO18_duathlon)	C++14	5 / 100	1076 ms	936 KiB

count_triplets

#include <bits/stdc++.h>
using namespace std;
vector<int> g[55];
bool vis[55];
int ans = 0;
bool dfs(int a, int b, int c, int u, int cnt){
	vis[u] = 1;
	if(cnt == 1 && u == b) cnt++;
	if(cnt == 2 && u == c){
		return 1;
	}
	for(int i=0;i<g[u].size();i++){
		int v = g[u][i];
		if(vis[v]) continue;
		if(dfs(a, b, c, v, cnt)) return 1;
	}
	vis[u] = 0;
	return 0;
}
int main(){
	int n, m;
	scanf("%d%d", &n, &m);
	for(int i=0;i<m;i++){
		int a, b;
		scanf("%d%d", &a, &b);
		g[a].push_back(b);
		g[b].push_back(a);
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			for(int k=1;k<=n;k++){
				memset(vis, 0, sizeof(vis));
				if(i == j || i == k || j == k) continue;
				ans += dfs(i, j, k, i, 1);
			}
		}
	}
	printf("%d\n", ans);
}

Compilation message (stderr)

count_triplets.cpp: In function 'bool dfs(int, int, int, int, int)':
count_triplets.cpp:12:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[u].size();i++){
              ~^~~~~~~~~~~~
count_triplets.cpp: In function 'int main()':
count_triplets.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~
count_triplets.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &a, &b);
   ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 8
• Subtask 4: 0 / 10
• Subtask 5: 0 / 13
• Subtask 6: 0 / 15
• Subtask 7: 0 / 20
• Subtask 8: 0 / 8
• Subtask 9: 0 / 10