oj.uz

Submission #97546

# Submission time Handle Problem Language Result Execution time Memory
97546 2019-02-17T01:09:31 Z jasony123123 Pipes (CEOI15_pipes) C++11
20 / 100
 1313 ms 13052 KB 
#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include <ext/pb_ds/tree_policy.hpp>
//#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
//using namespace __gnu_pbds;

#define FOR(i,start,end) for(int i=start;i<(int)(end);i++)
#define FORE(i,start,end) for(int i=start;i<=(int)end;i++)
#define RFOR(i,start,end) for(int i = start; i>end; i--)
#define RFORE(i,start,end) for(int i = start; i>=end; i--)
#define all(a) a.begin(), a.end()
#define mt make_tuple
#define mp make_pair
#define v vector
#define sf scanf
#define pf printf
#define dvar(x) cout << #x << " := " << x << "\n"
#define darr(x,n) FOR(i,0,n) cout << #x << "[" << i << "]" << " := " << x[i] << "\n"

typedef long long ll;
typedef long double ld;
typedef pair<int, int > pii;
typedef pair<ll, ll> pll;
//template <class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<class T> void minn(T &a, T b) { a = min(a, b); }
template<class T> void maxx(T &a, T b) { a = max(a, b); }

void io() {
#ifdef LOCAL_PROJECT 
	freopen("input.in", "r", stdin); freopen("output.out", "w", stdout);
#else
#endif
	ios_base::sync_with_stdio(false); cin.tie(NULL);
}

const ll INF = 1e14;
/***********************CEOI 2015 D1 Pipes*****************************************/

template <int SZ> struct UnionFind {
	int par[SZ];

	void init(int NN) {
		FOR(i, 0, NN) par[i] = i;
	}

	int find(int x) {
		if (par[x] != x) par[x] = find(par[x]);
		return par[x];
	}

	bool unite(int x, int y) {
		x = find(x), y = find(y);
		if (x == y) return false;
		par[y] = x;
		return true;
	}
};

int n, m;
UnionFind<100001> uf1, uf2;

v<int> adj[100001];
int lo[100001], ind[100001], t = 0;

void tarjan(int cur, int par = -1) {
	ind[cur] = lo[cur] = t++;
	for (int nex : adj[cur])  {
		if (ind[nex] == -1) {
			tarjan(nex, cur);
			lo[cur] = min(lo[cur], lo[nex]);
			if (lo[nex] > ind[cur]) {
				cout << cur << " " << nex << "\n";
			}
		}
		else if (nex != par)
			lo[cur] = min(lo[cur], ind[nex]);
	}
}

void findBridges() {
	FOR(i, 0, n + 1)
		ind[i] = -1, lo[i] = 0;
	FOR(i, 0, n + 1) if (ind[i] == -1)
		tarjan(i);
}


int main() {
	io();
	cin >> n >> m;

	uf1.init(n + 1), uf2.init(n + 1);
	FOR(i, 0, m) {
		int a, b; cin >> a >> b;
		if (uf1.unite(a, b) || uf2.unite(a, b)) {
			adj[a].push_back(b), adj[b].push_back(a);
		}
	}

	findBridges();
	return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2688 KB Output is correct
2 Incorrect 3 ms 2688 KB Wrong number of edges

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 3200 KB Output is correct
2 Incorrect 7 ms 2944 KB Wrong number of edges

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 95 ms 3040 KB Output is correct
2 Incorrect 93 ms 2936 KB Wrong number of edges

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 161 ms 3732 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 278 ms 5160 KB Output is correct
2 Correct 246 ms 4940 KB Output is correct

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 410 ms 9952 KB Output is correct
2 Incorrect 385 ms 7132 KB Wrong number of edges

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 659 ms 11096 KB Output is correct
2 Incorrect 663 ms 8676 KB Wrong number of edges

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 864 ms 13052 KB Output is correct
2 Incorrect 797 ms 8960 KB Wrong number of edges

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1136 ms 13028 KB Output is correct
2 Incorrect 1008 ms 8952 KB Wrong number of edges

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1313 ms 12524 KB Output is correct
2 Correct 1192 ms 10052 KB Output is correct