Submission #568531

#	Time	Username	Problem	Language	Result	Execution time	Memory
568531		Ooops_sorry	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	128 ms	262144 KiB

skyscraper

#include<bits/stdc++.h>

using namespace std;

#define pb push_back
#define ld double
#define ll long long

mt19937 rnd(51);

const int N = 30010, K = 30, INF = 1e9;
int d[N][K];
deque<pair<int,int>> arr[N * K];

signed main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
#endif // LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < K; j++) {
            d[i][j] = INF;
        }
    }
    int n, m;
    cin >> n >> m;
    vector<int> b(m), p(m), ans(n, INF);
    vector<vector<int>> need(n);
    for (int i = 0; i < m; i++) {
        cin >> b[i] >> p[i];
        need[b[i]].pb(abs(p[i]));
    }
    ans[b[0]] = 0;
    arr[0].pb({b[0], -1});
    for (int i = 0; i < N * K; i++) {
        while (arr[i].size() > 0) {
            int v = arr[i][0].first, j = arr[i][0].second;
            arr[i].pop_front();
            if (j == -1) {
                if (ans[v] != i) continue;
            } else if (d[v][j] != i) {
               continue;
            }
            if (j == -1) {
                for (auto to : need[v]) {
                    if (to < K) {
                        if (d[v][to] > ans[v]) {
                            d[v][to] = ans[v];
                            arr[i].pb({v, to});
                        }
                    } else {
                        for (int k = v, add = 0; k < n; k += to, add++) {
                            if (ans[k] > ans[v] + add) {
                                ans[k] = ans[v] + add;
                                if (ans[k] < N * K) arr[ans[k]].pb({k, -1});
                            }
                        }
                        for (int k = v, add = 0; k >= 0; k -= to, add++) {
                            if (ans[k] > ans[v] + add) {
                                ans[k] = ans[v] + add;
                                if (ans[k] < N * K) arr[ans[k]].pb({k, -1});
                            }
                        }
                    }
                }
            } else {
                if (d[v][j] < ans[v]) {
                    ans[v] = d[v][j];
                    arr[i].pb({v, -1});
                }
                if (v + j < n && d[v + j][j] > d[v][j] + 1) {
                    d[v + j][j] = d[v][j] + 1;
                    if (d[v + j][j] < N * K) arr[d[v + j][j]].pb({v + j, j});
                }
                if (v - j >= 0 && d[v - j][j] > d[v][j] + 1) {
                    d[v - j][j] = d[v][j] + 1;
                    if (d[v - j][j] < N * K) arr[d[v - j][j]].pb({v - j, j});
                }
            }
        }
    }
    cout << (ans[b[1]] == INF ? -1 : ans[b[1]]) << endl;
    return 0;
}

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