Submission #707321

#	Time	Username	Problem	Language	Result	Execution time	Memory
707321		Stickfish	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1087 ms	2260 KiB

skyscraper

#include <iostream>
#include <vector>
#include <bitset>
using namespace std;

const int MAXN = 30100;
const int INF = 1e9 + 177013;
pair<int, int> dogs[MAXN];
vector<int> jlen[MAXN];

bitset<MAXN> used;
int dist_long[MAXN];

signed main() {
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < m; ++i) {
        cin >> dogs[i].first >> dogs[i].second;
        jlen[dogs[i].first].push_back(dogs[i].second);
    }
    int s = dogs[0].first;
    int t = dogs[1].first;
    for (int i = 0; i < n; ++i)
        dist_long[i] = INF;
    dist_long[s] = 0;
    while (used.count() < n) {
        int v = -1;
        for (int i = 0; i < n; ++i) {
            if (!used[i] && (v == -1 || dist_long[v] > dist_long[i]))
                v = i;
        }
        if (dist_long[v] >= INF)
            break;
        used[v] = 1;
        for (auto p : jlen[v]) {
            for (int k = 1; p * k <= v; ++k)
                dist_long[v - p * k] = min(dist_long[v - p * k], dist_long[v] + k);
            for (int k = 1; v + p * k < n; ++k)
                dist_long[v + p * k] = min(dist_long[v + p * k], dist_long[v] + k);
        }
    }
    if (dist_long[t] >= INF)
        cout << "-1\n";
    else
        cout << dist_long[t] << '\n';
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:26:25: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   26 |     while (used.count() < n) {
      |            ~~~~~~~~~~~~~^~~

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