Submission #534648

#TimeUsernameProblemLanguageResultExecution timeMemory
534648perchutsPipes (CEOI15_pipes)C++17
100 / 100
1034 ms15868 KiB
#include <bits/stdc++.h> #define maxn (int)(1e5+51) #define all(x) x.begin(), x.end() #define sz(x) (int) x.size() #define endl '\n' #define ll long long #define pb push_back #define ull unsigned long long #define ii pair<int,int> #define iii tuple<int,int,int> #define inf 2000000001 #define mod 1000000007 //998244353 #define _ ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL); using namespace std; template<typename X, typename Y> bool ckmin(X& x, const Y& y) { return (y < x) ? (x=y,1):0; } template<typename X, typename Y> bool ckmax(X& x, const Y& y) { return (x < y) ? (x=y,1):0; } int lvl[maxn], par[maxn], lvl2[maxn], par2[maxn], in[maxn], low[maxn]; bool vis[maxn]; int findp(int x){ if(par[x]==x)return x; else return par[x] = findp(par[x]); } bool merge(int x,int y){ int a = x, b = y; x = findp(x), y = findp(y); if(x==y)return 0; if(lvl[x]<lvl[y])swap(x,y); par[y] = x; lvl[x] += lvl[y]; return 1; } int findp2(int x){ if(par2[x]==x)return x; else return par2[x] = findp2(par2[x]); } bool merge2(int x,int y){ int a = x, b = y; x = findp2(x), y = findp2(y); if(x==y)return 0; if(lvl2[x]<lvl2[y]){ swap(x,y); } par2[y] = x; lvl2[x] += lvl2[y]; return 1; } vector<int>g[maxn]; int cur; void dfs(int u,int p){ vis[u] = 1, low[u] = in[u] = ++cur; bool flag = 1; for(auto v:g[u]){ if(v==p&&flag){ flag = 0;continue; }else if(vis[v]){ ckmin(low[u],in[v]); }else{ dfs(v,u); ckmin(low[u],low[v]); if(low[v]>in[u])cout<<v<<" "<<u<<endl; } } } int main(){_ int n,m;cin>>n>>m; for(int i=1;i<=n;++i)lvl[i] = lvl2[i] = 0, par[i] = par2[i] = i; for(int i=0;i<m;++i){ int a,b;cin>>a>>b; if(merge(a,b)){ g[a].pb(b);g[b].pb(a); }else if(merge2(a,b)){ g[a].pb(b);g[b].pb(a); } } for(int i=1;i<=n;++i) if(!vis[i])dfs(i,i); }

Compilation message (stderr)

pipes.cpp: In function 'bool merge(int, int)':
pipes.cpp:29:9: warning: unused variable 'a' [-Wunused-variable]
   29 |     int a = x, b = y;
      |         ^
pipes.cpp:29:16: warning: unused variable 'b' [-Wunused-variable]
   29 |     int a = x, b = y;
      |                ^
pipes.cpp: In function 'bool merge2(int, int)':
pipes.cpp:43:9: warning: unused variable 'a' [-Wunused-variable]
   43 |     int a = x, b = y;
      |         ^
pipes.cpp:43:16: warning: unused variable 'b' [-Wunused-variable]
   43 |     int a = x, b = y;
      |                ^
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