Submission #1235904

#	Time	Username	Problem	Language	Result	Execution time	Memory
1235904		toast12	Zoo (COCI19_zoo)	C++20	110 / 110	82 ms	5192 KiB

zoo

#include <bits/stdc++.h>
using namespace std;

const int INF = 1e9;

int main() {
    int n, m;
    cin >> n >> m;
    vector<vector<char>> grid(n+2, vector<char>(m+2, '*'));
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) cin >> grid[i][j];
    }
    vector<vector<int>> dist(n+2, vector<int>(m+2, INF));
    dist[1][1] = 0;
    deque<pair<int, int>> d;
    d.push_front({1, 1});
    int ans = 0;
    while (!d.empty()) {
        int i = d.front().first, j = d.front().second;
        d.pop_front();
        ans = max(ans, dist[i][j]);
        vector<pair<int, int>> v;
        v.push_back({i-1, j});
        v.push_back({i+1, j});
        v.push_back({i, j-1});
        v.push_back({i, j+1});
        for (auto p : v) {
            if (grid[p.first][p.second] == '*') continue;
            int w = (grid[p.first][p.second] != grid[i][j]);
            if (dist[p.first][p.second] > dist[i][j]+w) {
                dist[p.first][p.second] = dist[i][j]+w;
                if (w) d.push_back(p);
                else d.push_front(p);
            }
        }
    }
    cout << ans+1 << '\n';
    return 0;
}

• Subtask 1: 45 / 45
• Subtask 2: 65 / 65