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Submission #975210

# Submission time Handle Problem Language Result Execution time Memory
975210 2024-05-04T14:52:10 Z XXBabaProBerkay Swapping Cities (APIO20_swap) C++17
0 / 100
 2000 ms 524288 KB 
#include "swap.h"
#include <bits/stdc++.h>
using namespace std;

#define F first
#define S second

using ll = long long;

const int INF = 1e9 + 7;

vector<int> dpth;
vector<vector<pair<int, int>>> adj;
vector<array<int, 20>> up, ans, res;

void DFS(int k, int p, int x);

void init(int N, int M, vector<int> U, vector<int> V, vector<int> W)
{
	adj.resize(N);
	dpth.resize(N);
	up = ans = res = vector<array<int, 20>>(N);
	for (int i = 0; i < M; i++)
	{
		adj[U[i]].emplace_back(V[i], W[i]);
		adj[V[i]].emplace_back(U[i], W[i]);
	}

	res[0][0] = INF;
	DFS(0, 0, INF);
}

void DFS(int k, int p, int x)
{
	dpth[k] = dpth[p] + 1;
	up[k][0] = p;
	ans[k][0] = x;
	for (int i = 1; i < 20; i++)
	{
		up[k][i] = up[up[k][i - 1]][i - 1];
		ans[k][i] = min(ans[k][i - 1], ans[up[k][i - 1]][i - 1]);
		res[k][i] = max(res[k][i - 1], res[up[k][i - 1]][i - 1]);
	}

	int mn = INF, mn2 = INF;
	for (pair<int, int> i : adj[k])
		if (i.F == p)
			continue;
		else if (i.S < mn)
		{
			mn2 = mn;
			mn = i.S;
		}
		else if (i.S < mn2)
			mn2 = i.S;

	for (pair<int, int> i : adj[k])
	{
		if (i.F == p)
			continue;

		res[i.F][0] = i.S;

		if (i.S == mn)
			DFS(i.F, k, mn2);
		else
			DFS(i.F, k, mn);
	}
}

array<int, 3> kth_ancestor(int a, int x)
{
	int as = INF, rs = -INF;
	for (int i = 0; i < 20; i++)
	{
		if (x & (1 << i))
		{
			as = min(as, ans[a][i]);
			rs = max(rs, res[a][i]);
			a = up[a][i];
		}
	}

	return {a, as, rs};
}

int getMinimumFuelCapacity(int X, int Y)
{
	if (dpth[X] < dpth[Y])
		swap(X, Y);

	int X0 = X, Y0 = Y;
	array<int, 3> ret = kth_ancestor(X, dpth[X] - dpth[Y]);

	if (ret[0] == Y)
	{
		ret = kth_ancestor(X, dpth[X] - dpth[Y] - 1);
		return (ret[1] == INF ? -1 : max(ret[1], ret[2]));
	}

	X = ret[0];

	for (int i = 19; i >= 0; i--)
		if (up[X][i] != up[Y][i])
			X = up[X][i], Y = up[Y][i];

	array<int, 3> rs1 = kth_ancestor(X0, dpth[X0] - dpth[X]);
	array<int, 3> rs2 = kth_ancestor(Y0, dpth[Y0] - dpth[Y]);

	int mn = INF, x = -INF, y = -INF;
	for (pair<int, int> i : adj[up[X][0]])
	{
		if (i.F == X)
		{
			x = i.S;
			continue;
		}
		if (i.F == Y)
		{
			y = i.S;
			continue;
		}

		mn = min(mn, i.S);
	}

	rs1[1] = min(rs1[1], mn);
	rs1[2] = max(rs1[2], x);
	rs2[2] = max(rs2[2], y);
	return (rs1[1] != INF || rs2[1] != INF ? max(max(rs1[2], rs2[2]), min(rs1[1], rs2[1])) : -1);
}

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 600 KB Output is correct
9 Correct 84 ms 28224 KB Output is correct
10 Correct 112 ms 35496 KB Output is correct
11 Correct 111 ms 34444 KB Output is correct
12 Correct 115 ms 36692 KB Output is correct
13 Correct 128 ms 38224 KB Output is correct
14 Correct 118 ms 27740 KB Output is correct
15 Correct 390 ms 37344 KB Output is correct
16 Correct 385 ms 37376 KB Output is correct
17 Correct 394 ms 42420 KB Output is correct
18 Correct 439 ms 41660 KB Output is correct
19 Execution timed out 2093 ms 350368 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Execution timed out 2047 ms 32632 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #3
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 600 KB Output is correct
9 Runtime error 1105 ms 524288 KB Execution killed with signal 9
10 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 1105 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 600 KB Output is correct
9 Correct 84 ms 28224 KB Output is correct
10 Correct 112 ms 35496 KB Output is correct
11 Correct 111 ms 34444 KB Output is correct
12 Correct 115 ms 36692 KB Output is correct
13 Correct 128 ms 38224 KB Output is correct
14 Correct 118 ms 27740 KB Output is correct
15 Correct 390 ms 37344 KB Output is correct
16 Correct 385 ms 37376 KB Output is correct
17 Correct 394 ms 42420 KB Output is correct
18 Correct 439 ms 41660 KB Output is correct
19 Execution timed out 2047 ms 32632 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 1105 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -