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Submission #975201

# Submission time Handle Problem Language Result Execution time Memory
975201 2024-05-04T14:45:56 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)
		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 0 ms 344 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 600 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 856 KB Output is correct
9 Correct 85 ms 28244 KB Output is correct
10 Correct 115 ms 35668 KB Output is correct
11 Correct 108 ms 34388 KB Output is correct
12 Correct 124 ms 36692 KB Output is correct
13 Correct 119 ms 38228 KB Output is correct
14 Correct 108 ms 27948 KB Output is correct
15 Incorrect 328 ms 37340 KB Output isn't correct
16 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Execution timed out 2037 ms 32452 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #3
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 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 600 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 856 KB Output is correct
9 Runtime error 1043 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 1043 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 0 ms 344 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 600 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 856 KB Output is correct
9 Correct 85 ms 28244 KB Output is correct
10 Correct 115 ms 35668 KB Output is correct
11 Correct 108 ms 34388 KB Output is correct
12 Correct 124 ms 36692 KB Output is correct
13 Correct 119 ms 38228 KB Output is correct
14 Correct 108 ms 27948 KB Output is correct
15 Incorrect 328 ms 37340 KB Output isn't correct
16 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 1043 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -