oj.uz

Submission #601123

# Submission time Handle Problem Language Result Execution time Memory
601123 2022-07-21T11:44:32 Z Lucpp Simurgh (IOI17_simurgh) C++17
30 / 100
 3000 ms 4880 KB 
#include "simurgh.h"
#include <bits/stdc++.h>
using namespace std;

int n, m;
vector<pair<int, int>> edges;
vector<vector<pair<int, int>>> g;
vector<int> good;

void calc(int i){
	int start = edges[i].first, goal = edges[i].second;
	queue<int> q;
	q.push(start);
	vector<bool> vis(n);
	vis[start] = true;
	vector<pair<int, int>> last(n);
	while(!q.empty()){
		int u = q.front();
		q.pop();
		for(auto [v, ind] : g[u]){
			if(ind == i || good[ind] == 0) continue;
			if(!vis[v]){
				vis[v] = true;
				q.push(v);
				last[v] = {u, ind};
			}
		}
	}
	if(!vis[goal]){ // bridge
		good[i] = true;
		return;
	}
	vector<int> cycle;
	vector<int> inCycle(m);
	int u = goal;
	while(u != start){
		inCycle[last[u].second] = true;
		cycle.push_back(last[u].second);
		u = last[u].first;
	}
	inCycle[i] = true;
	cycle.push_back(i);
	vector<int> forest;
	for(u = 0; u < n; u++){
		if(u != start){
			int e = last[u].second;
			if(!inCycle[e]) forest.push_back(e);
		}
	}
	int c = (int)cycle.size();
	vector<int> ans(c);
	for(int j = 0; j < c; j++){
		if(good[cycle[j]] == 1) ans[j] = -1;
		else{
			vector<int> v;
			for(int k = 0; k < c; k++){
				if(k != j) v.push_back(cycle[k]);
			}
			for(int e : forest) v.push_back(e);
			ans[j] = count_common_roads(v);
		}
	}
	for(int j = 0; j < c; j++){
		int ma = 0;
		for(int k = 0; k < c; k++){
			if(j != k) ma = max(ma, ans[k]);
		}
		good[cycle[j]] = ma > ans[j];
	}
}

mt19937 mt(1243234);

vector<bool> vis;
vector<int> path;
void dfs(int u){
	vis[u] = true;
	shuffle(g[u].begin(), g[u].end(), mt);
	for(auto [v, ind] : g[u]){
		if(vis[v] || good[ind] == 0) continue;
		dfs(v);
		path.push_back(ind);
	}
}

vector<int> find_roads(int n_, vector<int> u, vector<int> v) {
	n = n_;
	m = (int)u.size();
	g.resize(n);
	for(int i = 0; i < m; i++){
		edges.emplace_back(u[i], v[i]);
		g[u[i]].emplace_back(v[i], i);
		g[v[i]].emplace_back(u[i], i);
	}
	good.resize(m, -1);
	for(int it = 0; it < 500; it++){
		path.clear();
		vis.assign(n, false);
		dfs(0);
		if((int)path.size() != n-1) break;
		if(count_common_roads(path) == 0){
			for(int e : path) good[e] = 0;
		}
	}
	for(int i = 0; i < m; i++){
		if(good[i] == -1){
			calc(i);
		}
	}
	vector<int> r;
	for(int i = 0; i < m; i++) if(good[i] == 1) r.push_back(i);
	return r;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB correct
2 Correct 1 ms 212 KB correct
3 Correct 1 ms 212 KB correct
4 Correct 1 ms 212 KB correct
5 Correct 1 ms 212 KB correct
6 Correct 1 ms 212 KB correct
7 Correct 0 ms 212 KB correct
8 Correct 1 ms 212 KB correct
9 Correct 1 ms 308 KB correct
10 Correct 1 ms 312 KB correct
11 Correct 1 ms 212 KB correct
12 Correct 1 ms 212 KB correct
13 Correct 1 ms 212 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB correct
2 Correct 1 ms 212 KB correct
3 Correct 1 ms 212 KB correct
4 Correct 1 ms 212 KB correct
5 Correct 1 ms 212 KB correct
6 Correct 1 ms 212 KB correct
7 Correct 0 ms 212 KB correct
8 Correct 1 ms 212 KB correct
9 Correct 1 ms 308 KB correct
10 Correct 1 ms 312 KB correct
11 Correct 1 ms 212 KB correct
12 Correct 1 ms 212 KB correct
13 Correct 1 ms 212 KB correct
14 Correct 23 ms 392 KB correct
15 Correct 28 ms 340 KB correct
16 Correct 27 ms 340 KB correct
17 Correct 19 ms 312 KB correct
18 Correct 8 ms 308 KB correct
19 Correct 20 ms 340 KB correct
20 Correct 21 ms 384 KB correct
21 Correct 18 ms 372 KB correct
22 Correct 15 ms 340 KB correct
23 Correct 14 ms 352 KB correct
24 Correct 13 ms 340 KB correct
25 Correct 3 ms 212 KB correct
26 Correct 13 ms 468 KB correct
27 Correct 13 ms 352 KB correct
28 Correct 6 ms 212 KB correct
29 Correct 4 ms 212 KB correct
30 Correct 15 ms 304 KB correct
31 Correct 14 ms 340 KB correct
32 Correct 14 ms 356 KB correct
33 Correct 14 ms 304 KB correct

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB correct
2 Correct 1 ms 212 KB correct
3 Correct 1 ms 212 KB correct
4 Correct 1 ms 212 KB correct
5 Correct 1 ms 212 KB correct
6 Correct 1 ms 212 KB correct
7 Correct 0 ms 212 KB correct
8 Correct 1 ms 212 KB correct
9 Correct 1 ms 308 KB correct
10 Correct 1 ms 312 KB correct
11 Correct 1 ms 212 KB correct
12 Correct 1 ms 212 KB correct
13 Correct 1 ms 212 KB correct
14 Correct 23 ms 392 KB correct
15 Correct 28 ms 340 KB correct
16 Correct 27 ms 340 KB correct
17 Correct 19 ms 312 KB correct
18 Correct 8 ms 308 KB correct
19 Correct 20 ms 340 KB correct
20 Correct 21 ms 384 KB correct
21 Correct 18 ms 372 KB correct
22 Correct 15 ms 340 KB correct
23 Correct 14 ms 352 KB correct
24 Correct 13 ms 340 KB correct
25 Correct 3 ms 212 KB correct
26 Correct 13 ms 468 KB correct
27 Correct 13 ms 352 KB correct
28 Correct 6 ms 212 KB correct
29 Correct 4 ms 212 KB correct
30 Correct 15 ms 304 KB correct
31 Correct 14 ms 340 KB correct
32 Correct 14 ms 356 KB correct
33 Correct 14 ms 304 KB correct
34 Correct 2365 ms 2004 KB correct
35 Correct 2116 ms 1964 KB correct
36 Correct 1314 ms 1648 KB correct
37 Correct 40 ms 340 KB correct
38 Correct 2399 ms 2000 KB correct
39 Correct 2037 ms 1832 KB correct
40 Correct 1378 ms 1636 KB correct
41 Execution timed out 3065 ms 1880 KB Time limit exceeded
42 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB correct
2 Correct 1 ms 212 KB correct
3 Execution timed out 3054 ms 4880 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB correct
2 Correct 1 ms 212 KB correct
3 Correct 1 ms 212 KB correct
4 Correct 1 ms 212 KB correct
5 Correct 1 ms 212 KB correct
6 Correct 1 ms 212 KB correct
7 Correct 0 ms 212 KB correct
8 Correct 1 ms 212 KB correct
9 Correct 1 ms 308 KB correct
10 Correct 1 ms 312 KB correct
11 Correct 1 ms 212 KB correct
12 Correct 1 ms 212 KB correct
13 Correct 1 ms 212 KB correct
14 Correct 23 ms 392 KB correct
15 Correct 28 ms 340 KB correct
16 Correct 27 ms 340 KB correct
17 Correct 19 ms 312 KB correct
18 Correct 8 ms 308 KB correct
19 Correct 20 ms 340 KB correct
20 Correct 21 ms 384 KB correct
21 Correct 18 ms 372 KB correct
22 Correct 15 ms 340 KB correct
23 Correct 14 ms 352 KB correct
24 Correct 13 ms 340 KB correct
25 Correct 3 ms 212 KB correct
26 Correct 13 ms 468 KB correct
27 Correct 13 ms 352 KB correct
28 Correct 6 ms 212 KB correct
29 Correct 4 ms 212 KB correct
30 Correct 15 ms 304 KB correct
31 Correct 14 ms 340 KB correct
32 Correct 14 ms 356 KB correct
33 Correct 14 ms 304 KB correct
34 Correct 2365 ms 2004 KB correct
35 Correct 2116 ms 1964 KB correct
36 Correct 1314 ms 1648 KB correct
37 Correct 40 ms 340 KB correct
38 Correct 2399 ms 2000 KB correct
39 Correct 2037 ms 1832 KB correct
40 Correct 1378 ms 1636 KB correct
41 Execution timed out 3065 ms 1880 KB Time limit exceeded
42 Halted 0 ms 0 KB -