Submission #400703

#	Time	Username	Problem	Language	Result	Execution time	Memory
400703		BERNARB01	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	10 / 100	4 ms	6732 KiB

skyscraper

#include <bits/stdc++.h>

using namespace std;

const int N = 10;
const int inf = 1e9 + 9;

int n, m, target, b[N], p[N], dp[N][N][2][1 << N][8];
vector<int> g[N];

int sol(int i, int j, int dir, int vis, int dn) {
	if (vis & (1 << i)) {
		return inf;
	}
	if (i == target) {
		return 0;
	}
	int& ret = dp[i][j][dir][vis][dn];
	if (ret != -1) {
		return ret;
	}
	ret = inf;
	int new_v = vis | (1 << i);
	if (dir) {
		if (i + p[j] < n) {
			ret = min(ret, 1 + sol(i + p[j], j, dir, new_v, dn));
		}
	} else {
		if (i - p[j] >= 0) {
			ret = min(ret, 1 + sol(i - p[j], j, dir, new_v, dn));
		}
	}
	for (int new_j : g[i]) {
		if (new_j != j && !(dn & (1 << new_j))) {
			ret = min(ret, sol(i, new_j, 1, 0, dn | (1 << j)));
			ret = min(ret, sol(i, new_j, 0, 0, dn | (1 << j)));
		}
	}
	return ret;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cin >> n >> m;
	for (int i = 0; i < m; i++) {
		cin >> b[i] >> p[i];
		g[b[i]].push_back(i);
	}
	target = b[1];
	memset(dp, -1, sizeof dp);
	int ans = sol(0, 0, 1, 0, 1);
	if (ans >= inf) {
		cout << -1 << '\n';
	} else {
		cout << ans << '\n';
	}
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43