Submission #152693

#TimeUsernameProblemLanguageResultExecution timeMemory
152693toloraiaPipes (CEOI15_pipes)C++14
30 / 100
2380 ms65540 KiB
#include <bits/stdc++.h> #define F first #define S second #define mp make_pair #define pb push_back #define ll long long #define LEFT(a) ((a)<<1) #define RIGHT(a) (LEFT(a) + 1) #define MID(a,b) ((a+b)>>1) #define MAX(a,b) ((a)>(b)?(a):(b)) #define MIN(a,b) ((a)<(b)?(a):(b)) //#pragma comment(linker, "/STACK: 20000000005") #pragma GCC optimize("Ofast") #pragma GCC target("avx2,fma") #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") #pragma GCC target ("avx2") #pragma GCC optimization ("O3") #pragma GCC optimization ("unroll-loops") using namespace std; const int N = 1e5 + 5, M = 6e6 + 5; int n, m; int nn, u[N], v[N]; vector < int > g[N]; int T; int in[N], up[N]; void dfs (int k, int p){ in[k] = ++T; up[k] = in[k]; int to; for (int toto : g[k]){ to = abs (toto); if (to == p) continue; if (in[to]){ up[k] = min (up[k], in[to]); continue; } dfs (to, k); if (up[to] > in[k] && toto > 0){ nn++; u[nn] = k; v[nn] = to; } up[k] = min (up[k], up[to]); } } pair < int, int > P[M]; main() { //freopen ("in.in", "r", stdin);freopen ("out.out", "w", stdout); ios_base::sync_with_stdio(false); cin >> n >> m; for (int i = 1; i <= m; i++){ cin >> P[i].F >> P[i].S; } sort (P + 1, P + m + 1); for (int i = 1; i <= m; i++){ if (P[i] == P[i - 1]) continue; if (P[i + 1] != P[i]){ g[P[i].F].pb (P[i].S); g[P[i].S].pb (P[i].F); } else { g[P[i].F].pb (-P[i].S); g[P[i].S].pb (-P[i].F); } } for (int i = 1; i <= n; i++) if (in[i] == 0) dfs (i, 0); for (int i = 1; i <= nn; i++) cout << u[i] << " " << v[i] << endl; return 0; }

Compilation message (stderr)

pipes.cpp:17:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("O3")
 
pipes.cpp:18:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("unroll-loops")
 
pipes.cpp:55:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
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