Submission #374955

#	Time	Username	Problem	Language	Result	Execution time	Memory
374955		Alma	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	1 ms	384 KiB

skyscraper

#include <iostream>
#include <cmath>
#include <vector>
#include <algorithm>
using namespace std;

vector<int> position;
vector<int> DP;

int minimumJumps (int l, int r, int idx, vector<bool> & visited, int jumps) {
    if (idx == 1) {
        return 0;
    } else if (DP[idx] != -1) {
        return DP[idx];
    }
    visited[idx] = true;
    int left, right, p = position[idx];
    left = idx - p;
    for (int i = 1; left >= l; i++) {
        if (position[left] != 0 && !visited[left]) {
            jumps = min(jumps, i + minimumJumps(l, r, left, visited, jumps));
        }
        left -= p;
    }
    right = idx + p;
    for (int i = 1; right <= r; i++) {
        if (position[right] != 0 && !visited[right]) {
            jumps = min(jumps, i + minimumJumps(l, r, right, visited, jumps));
        }
        right += p;
    }
    return DP[idx] = jumps;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    int n, m, x, p, answer;
    cin >> n >> m;
    position.assign(n, 0);
    DP.assign(n, -1);
    vector<bool> visited(n, false);
    while (m--) {
        cin >> x >> p;
        position[x] = p;
    }
    position[1] = 1e9;
    answer = minimumJumps(0, n-1, 0, visited, 1e9);
    if (answer == 1e9) {
        cout << -1 << '\n';
    } else {
        cout << answer << '\n';
    }
    return 0;
}

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