Submission #1193409

#TimeUsernameProblemLanguageResultExecution timeMemory
1193409vnedu우호 조약 체결 (JOI14_friends)C++17
0 / 100
25 ms4932 KiB
#include<bits/stdc++.h> using namespace std; typedef long long ll; template<class T> bool maximize(T &a, const T &b){ return (a < b ? a = b, 1 : 0); } template<class T> bool minimize(T &a, const T &b){ return (a > b ? a = b, 1 : 0); } #define fi first #define se second #define pb push_back #define ii pair<int, int> #define all(x) x.begin(), x.end() #define TASK "nonsense" /// end of template /// const int N = 1e5 + 10; int n,m,par[N],vis[N],sz[N]; vector<int> adj[N]; int get(int x) { if(x==par[x]) return x; return par[x]=get(par[x]); } void unite(int x, int y) { int s=get(x),t=get(y); if(s==t) return; par[s]=t; sz[t]+=sz[s]; } queue<int> q; void solve() { cin>>n>>m; for(int i=1;i<=m;++i) { int x,y; cin>>x>>y; adj[x].pb(y); adj[y].pb(x); } for(int i=1;i<=n;++i) par[i]=i,sz[i]=1; for(int i=1;i<=n;++i) if((int)adj[i].size()>1) { int root=adj[i][0]; for(int x : adj[i]) { unite(root,x); if(!vis[x]) { q.push(x); vis[x]=x; } else { unite(vis[x],x); } } } while(!q.empty()) { int u=q.front(); q.pop(); for(int v : adj[u]) { if(vis[v]) unite(vis[v],vis[u]); else { vis[v]=vis[u]; q.push(v); } } } ll ans=0; for(int i=1;i<=n;++i) if(get(i)==i) { if(sz[i]==1) ans+=(int)adj[i].size(); else ans+=sz[i]*1LL*(sz[i]-1)/2; } cout<<ans; } int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); // freopen(TASK".inp","r",stdin); // freopen(TASK".out","w",stdout); int testcase=1; // cin>>testcase; while (testcase--) solve(); return 0; }
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