Submission #377450

#	Time	Username	Problem	Language	Result	Execution time	Memory
377450		NONAME	Selotejp (COCI20_selotejp)	C++17	110 / 110	31 ms	504 KiB

Main

#include <bits/stdc++.h>
using namespace std;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

int_fast32_t n, m;
int_fast32_t dp[2][1 << 11];
char a[1000][10];

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n >> m;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            cin >> a[i][j];
        }
    }

    int tp = 0;
    for (int i : {0, 1}) {
        for (int msk = 0; msk < (1 << m); ++msk) {
            dp[i][msk] = 1e9;
        }
    }
    dp[0][0] = 0;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            int nt = tp ^ 1;
            for (int msk = 0; msk < (1 << m); ++msk) {
                if (!((msk >> j) & 1)) {
                    int c = 0;
                    if ((a[i][j] == '#') && (!j || (a[i][j - 1] == '.') || ((msk >> (j - 1)) & 1))) {
                        c = 1;
                    }
                    dp[nt][msk] = min(dp[tp][msk], dp[tp][msk ^ (1 << j)]) + c;
                } else {
                    if (a[i][j] == '.') {
                        dp[nt][msk] = 1e9;
                    } else {
                        dp[nt][msk] = min(dp[tp][msk], dp[tp][msk ^ (1 << j)] + 1);
                    }
                }
            }
            tp ^= 1;
        }
    }

    int_fast32_t ans = 1e9;
    for (int msk = 0; msk < (1 << m); ++msk) {
        ans = min(ans, dp[tp][msk]);
    }
    cout << ans << "\n";

    return 0;
}

• Subtask 1: 35 / 35
• Subtask 2: 35 / 35
• Subtask 3: 40 / 40