oj.uz

Submission #560684

# Submission time Handle Problem Language Result Execution time Memory
560684 2022-05-11T22:51:42 Z urosk Pipes (CEOI15_pipes) C++14
0 / 100
 1162 ms 65536 KB 
// __builtin_popcount(x)
// __builtin_popcountll(x)
#define here cerr<<"===========================================\n"
#include <bits/stdc++.h>
#define ld double
#define ll int
#define ull unsigned long long
#define llinf 100000000000000000LL // 10^17
#define iinf 2000000000 // 2*10^9
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define endl '\n'
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define sz(a) int(a.size())
#define all(a) a.begin(),a.end()
#define ceri(a,l,r) {for(ll i_ = l;i_<=r;i_++) cerr<<a[i_]<< " ";cerr<<endl;}
using namespace std;

#define maxn 100005
ll n,m;
ll dsu[maxn];
ll dsu2[maxn];
vector<ll> g[maxn];
ll low[maxn];
ll in[maxn];
vector<pll> bridge;
bool vis[maxn];
ll root(ll x,ll* dsu){
    while(x!=dsu[x]){
       dsu[x] = dsu[dsu[x]];
       x = dsu[x];
    }
    return x;
}
void upd(ll x,ll y,ll* dsu){
    x = root(x,dsu);
    y = root(y,dsu);
    dsu[y] = x;
}
bool get(ll x,ll y,ll* dsu){return root(x,dsu)==root(y,dsu);}
ll it = 1;
void dfs(ll u,ll par){
    in[u] = low[u] = it++;
    vis[u] = 1;
    for(ll s : g[u]){
        if(s==par) continue;
        if(!vis[s]) dfs(s,u);
        low[u] = min(low[u],low[s]);
    }
    if(low[u]>in[par]) bridge.pb({u,par});
}
int main(){
	ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
    cin >> n >> m;
    iota(dsu+1,dsu+n+1,1);
    iota(dsu2+1,dsu2+n+1,1);
    vector<pll> v;
    for(ll i = 1;i<=m;i++){
        ll x,y; cin >> x >> y;
        if(get(x,y,dsu)){
            if(get(x,y,dsu2)) continue;
            upd(x,y,dsu2);
        }else upd(x,y,dsu);
        g[x].pb(y);
        g[y].pb(x);
        v.pb({x,y});
    }
    for(ll i = 1;i<=n;i++) if(!vis[i]) dfs(i,i);
    for(pll p : bridge) cout<<p.fi<< " "<<p.sc<<endl;
	return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Incorrect 2 ms 2680 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3396 KB Output is correct
2 Incorrect 5 ms 3156 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 92 ms 8560 KB Output is correct
2 Incorrect 101 ms 8264 KB Wrong number of edges
3 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 140 ms 13568 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 289 ms 21992 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 368 ms 32496 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 543 ms 46324 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 751 ms 59244 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 938 ms 58116 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1162 ms 65536 KB Memory limit exceeded
2 Halted 0 ms 0 KB -