Submission #375704

#	Time	Username	Problem	Language	Result	Execution time	Memory
375704		Alma	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	1 ms	492 KiB

skyscraper

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

vector<vector<pair<int, int>>> position;
vector<int> DP;

int minimumJumps (int l, int r, int idx, vector<bool> & visited, int jumps) {
    // base case
    if (DP[idx] != -1) {
        return DP[idx];
    }
    visited[idx] = true;
    // visit all posible conections
    for (auto conx: position[idx]) {
        int doge = conx.first, p = conx.second;
        if (p == 0) {
            continue;
        }
        // to the left
        int left = idx - p;
        for (int i = 1; l <= left; i++) {
            if (!position[left].empty() && !visited[left]) {
                jumps = min(jumps, i + minimumJumps(l, r, left, visited, jumps));
            }
            left -= p;
        }
        // to the right
        int right = idx + p;
        for (int i = 1; right <= r; i++) {
            if (!position[right].empty() && !visited[right]) {
                jumps = min(jumps, i + minimumJumps(l, r, right, visited, jumps));
            }
            right += p;
        }
    }
    // build the DP
    return DP[idx] = jumps;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    int n, m, x, p, answer, pos0;
    cin >> n >> m;
    position.assign(n, vector<pair<int, int>>());
    DP.assign(n, -1);
    vector<bool> visited(n, false);
    // doge 0
    cin >> x >> p;
    position[x].push_back(make_pair(0, p));
    pos0 = x;
    // doge 1
    cin >> x >> p;
    position[x].push_back(make_pair(1, p));
    DP[x] = 0;
    // other doges
    m -= 2;
    for (int i = 0; i < m; i++) {
        cin >> x >> p;
        position[x].push_back(make_pair(i, p));
    }
    // call function
    answer = minimumJumps(0, n-1, pos0, visited, 1e9);
    if (answer == 1e9) {
        cout << "-1\n";
    } else {
        cout << answer << '\n';
    }
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int minimumJumps(int, int, int, std::vector<bool>&, int)':
skyscraper.cpp:18:13: warning: unused variable 'doge' [-Wunused-variable]
   18 |         int doge = conx.first, p = conx.second;
      |             ^~~~

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