#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,v.size()) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<x.F<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define Add(x,y) x=(x+y)%mod
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first
const int N=1005;
int n,m,a[N],mark[N];
vector<int> g[N];
void dfs1(int u,int p,int x){
if(u==x){
mark[x]=1;
}
for(auto v : g[u]){
if(v==p) continue ;
dfs1(v,u,x);
if(mark[v]) mark[u]=1;
}
}
int dfs2(int u,int p){
if(mark[u]) return 0;
int ans=N;
for(auto v : g[u]){
if(v==p) continue ;
minm(ans,dfs2(v,u)+1);
}
return ans;
}
int32_t main(){
ios:: sync_with_stdio(0), cin.tie(0), cout.tie(0);
cin>>n>>m;
f(i,0,m){
int u,v;
cin>>u>>v;
g[u].pb(v);
g[v].pb(u);
}
if(m>n-1) return cout<<"NO"<<'\n',0;
f(i,1,n+1){
f(j,1,n+1){
memset(mark,sizeof mark,0);
int ans=1;
dfs1(i,0,j);
f(k,1,n+1) if(dfs2(k,0)>2) ans=0;
if(ans) return cout<<"YES"<<'\n',0;
}
}
cout<<"NO"<<'\n';
}
Compilation message
newspapers.cpp: In function 'int32_t main()':
newspapers.cpp:59:29: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters [-Wmemset-transposed-args]
59 | memset(mark,sizeof mark,0);
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
340 KB |
Unexpected end of file - int32 expected |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
340 KB |
Unexpected end of file - int32 expected |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
340 KB |
Unexpected end of file - int32 expected |
| 2 |
Halted |
0 ms |
0 KB |
- |
