Submission #34386

#	Time	Username	Problem	Language	Result	Execution time	Memory
34386		mohammad_kilani	Potemkin cycle (CEOI15_indcyc)	C++14	10 / 100	1000 ms	2016 KiB

indcyc

#include <bits/stdc++.h>
using namespace std;
#define mod 1000007
#define oo 2000000000
const int N = 101;
bitset< N > con[N];
int n , m;
int vis[N] , vi = 0 , num = 0 ;

void DFS(int node,vector<int> &v){
	vis[node] = vi;
	num++;
	for(int i=0;i<v.size();i++){
		if(vis[v[i]] != vi && con[node][v[i]]){
			DFS(v[i],v);
		}
	}
}

void solve(vector<int> &v,int i){
	if(i == n+1){
		if(v.size() < 4) return;
		bool can = true;
		num = 0 ;
		vi++;
		DFS(v[0],v);
		if(num != v.size()) return;
		for(int j=0;j<v.size();j++){
			int cur = 0;
			for(int k=0;k<v.size();k++){
				if(j == k) continue;
				if(con[v[j]][v[k]]) cur++;
			}
			if(cur != 2) can = false;
		}
		if(can){
			for(int i=0;i<v.size();i++) printf((i == 0 ? "%d" : " %d"),v[i]);
			puts("");
			exit(0);
		}
		return ;
	}
	solve(v,i+1);
	v.push_back(i);
	solve(v,i+1);
	v.pop_back();
}
 
int main() {
	//freopen("in.txt","r",stdin);
	scanf("%d%d",&n,&m);
	for(int i=0;i<m;i++){
		int u ,v ;
		scanf("%d%d",&u,&v);
		con[u][v] = con[v][u] = true;
	}
	vector<int> ans;
	solve(ans,1);
	puts("no");
	return 0;
}

Compilation message (stderr)

indcyc.cpp: In function 'void DFS(int, std::vector<int>&)':
indcyc.cpp:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<v.size();i++){
               ^
indcyc.cpp: In function 'void solve(std::vector<int>&, int)':
indcyc.cpp:27:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(num != v.size()) return;
          ^
indcyc.cpp:28:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j<v.size();j++){
                ^
indcyc.cpp:30:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int k=0;k<v.size();k++){
                 ^
indcyc.cpp:37:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<v.size();i++) printf((i == 0 ? "%d" : " %d"),v[i]);
                 ^
indcyc.cpp: In function 'int main()':
indcyc.cpp:51:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
                     ^
indcyc.cpp:54:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&u,&v);
                      ^

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10