oj.uz

Submission #82529

# Submission time Handle Problem Language Result Execution time Memory
82529 2018-10-31T10:03:23 Z Good Evacuation plan (IZhO18_plan) C++11
0 / 100
 3166 ms 20612 KB 
#include <algorithm>
#include <iostream>
#include <string.h>
#include <stdio.h>
#include <vector>
#include <queue>
#include <cmath>
#include <set>
#include <map>

#define N 100010
#define ff first
#define ss second
#define pb push_back
#define ll long long
#define pii pair <int, int>

using namespace std;

int k;
int n, m, q;
int a, b, c;

int Par[N];
int ans[N*5];
int v[N], vis[N];
pii p[N*5], P[N];
int L[N*5], R[N*5];
vector <pii> E[N];
priority_queue <pii, vector <pii>, greater <pii>> Q;

int ata(int x)
{
	if (x == Par[x]) return x;
	
	return Par[x] = ata(Par[x]);
}

void uni(int x, int y) {
	x = ata(x);
	y = ata(y);
	
	if (x == y) return;
	
	Par[y] = x;
}

int main()
{
	cin >> n >> m;
	
	for(int i = 1; i <= n; i++)
		L[i] = 0, R[i] = 1e9, v[i] = 1e9;
	
	for(int i = 1; i <= m; i++) {
		cin >> a >> b >> c;
		
		E[a].pb({b, c});
		E[b].pb({a, c});
	}
	
	cin >> k;
	
	for(int i = 1; i <= k; i++) {
		cin >> a;
		Q.push({0, a}), v[a] = 0;
	}
	
	while(!Q.empty()) {
		pii t = Q.top();
		Q.pop();
		
		if (vis[t.ss] == 1) continue;
		vis[t.ss] = 1;
		
		for(auto i: E[t.ss])
			if (i.ss + t.ff < v[i.ff])
				v[i.ff] = i.ss + t.ff, Q.push({v[i.ff], i.ff});
	}
	
	for(int i = 1; i <= n; i++) P[i] = {v[i], i};
	
	sort(P+1, P+n+1);
	
	cin >> q;
	
	for(int i = 1; i <= q; i++)
		cin >> p[i].ff >> p[i].ss;
	
	P[0] = {-1, -1};
	while(1) {
		vector <pii> M;
		
		for(int i = 1; i <= n; i++) Par[i] = i;
		
		for(int i = 1; i <= q; i++)
			if (L[i] <= R[i])
				M.pb({(L[i] + R[i])/2, i});
		
		if (M.empty()) break;
		
		sort(M.begin(), M.end());
		
		memset(vis, 0, sizeof (vis));
		
		for(int i = n; i >= 0; i--)
		{
			while(!M.empty() && M.back().ff > P[i].ff) {
				pii last = M.back();
				
				a = p[last.ss].ff;
				b = p[last.ss].ss;
				
				if (ata(a) == ata(b)) ans[last.ss] = last.ff, L[last.ss] = last.ff + 1;
				else R[last.ss] = last.ff - 1;
				
				M.pop_back();
			}
			
			int nd = P[i].ss;
			
			vis[nd] = 1;
			for(auto h: E[nd])
				if (vis[h.ff]) uni(nd, h.ff);
		}
	}
	for(int i = 1; i <= q; i++) cout << ans[i] << '\n';
}
/*
10 13
1 10 20
4 9 14
5 6 10
9 7 10
7 8 8
7 6 7
4 5 5
10 9 5
10 3 3
3 4 3
10 7 3
2 3 2
1 2 1
2
9 8
2
3 6
4 10
4 7

*/

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3064 KB Output is correct
2 Correct 9 ms 3192 KB Output is correct
3 Correct 9 ms 3192 KB Output is correct
4 Incorrect 5 ms 3064 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3064 KB Output is correct
2 Correct 9 ms 3192 KB Output is correct
3 Correct 9 ms 3192 KB Output is correct
4 Incorrect 5 ms 3064 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 3064 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1458 ms 12524 KB Output is correct
2 Correct 3166 ms 20548 KB Output is correct
3 Correct 3164 ms 20612 KB Output is correct
4 Runtime error 210 ms 17144 KB Execution killed with signal 11 (could be triggered by violating memory limits)
5 Halted 0 ms 0 KB -

Subtask #5
0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3064 KB Output is correct
2 Correct 9 ms 3192 KB Output is correct
3 Correct 9 ms 3192 KB Output is correct
4 Incorrect 5 ms 3064 KB Output isn't correct
5 Halted 0 ms 0 KB -