Submission #1068961

#	Time	Username	Problem	Language	Result	Execution time	Memory
1068961		blackslex	Wombats (IOI13_wombats)	C++17	55 / 100	732 ms	184656 KiB

wombats

#include "wombats.h"
#include<bits/stdc++.h>

using namespace std;
using pii = pair<int, int>;

const int N = 5005, K = 205;
int n, m, ch[N][K], cv[N][K], d[N][K];
vector<pii> v[N * K];
bool f[K];

int get (int x, int y) {
    return x * m + y;
}

void init(int R, int C, int H[5000][200], int V[5000][200]) {
    n = R; m = C;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m - 1; j++) {
            ch[i][j] = H[i][j];
            v[get(i, j)].emplace_back(get(i, j + 1), H[i][j]);
            v[get(i, j + 1)].emplace_back(get(i, j), H[i][j]);
        }
    }
    for (int i = 0; i < n - 1; i++) {
        for (int j = 0; j < m; j++) {
            cv[i][j] = V[i][j];
            v[get(i, j)].emplace_back(get(i + 1, j), V[i][j]);
        }
    }
    for (int i = 0; i < m; i++) f[i] = 1;
}

void changeH(int P, int Q, int W) {
    int st = get(P, Q), ed = get(P, Q + 1);
    v[st].erase(find(v[st].begin(), v[st].end(), pii(ed, ch[P][Q])));
    v[ed].erase(find(v[ed].begin(), v[ed].end(), pii(st, ch[P][Q])));
    ch[P][Q] = W;
    v[st].emplace_back(ed, W);
    v[ed].emplace_back(st, W);
    for (int i = 0; i < m; i++) f[i] = 1;
}

void changeV(int P, int Q, int W) {
    int st = get(P, Q), ed = get(P + 1, Q);
    v[st].erase(find(v[st].begin(), v[st].end(), pii(ed, cv[P][Q])));
    cv[P][Q] = W;
    v[st].emplace_back(ed, W);
    for (int i = 0; i < m; i++) f[i] = 1;
}

int escape(int V1, int V2) {
    int st = get(0, V1), ed = get(n - 1, V2);
    if (f[V1]) {
        for (int i = 0; i < n * m; i++) d[i][V1] = 1e9;
        priority_queue<pii, vector<pii>, greater<pii>> pq;
        pq.emplace(d[st][V1] = 0, st);
        while (!pq.empty()) {
            auto [nd, nn] = pq.top(); pq.pop();
            for (auto &[tn, td]: v[nn]) {
                if (d[tn][V1] > d[nn][V1] + td) pq.emplace(d[tn][V1] = d[nn][V1] + td, tn);
            }
        }
        f[V1] = 0;
    }
    return d[ed][V1];
}

Compilation message (stderr)

grader.c: In function 'int main()':
grader.c:15:6: warning: variable 'res' set but not used [-Wunused-but-set-variable]
   15 |  int res;
      |      ^~~

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 16 / 16
• Subtask 4: 18 / 18
• Subtask 5: 0 / 21
• Subtask 6: 0 / 24