Submission #446806

#	Time	Username	Problem	Language	Result	Execution time	Memory
446806		Valaki2	Colouring a rectangle (eJOI19_colouring)	C++14	10 / 100	62 ms	3524 KiB

colouring

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

#define ll long long

int n, m;

void solve_n_1() {
    vector<ll> a(n + m - 1, 0);
    vector<ll> b(n + m - 1, 0);
    for(ll &x : a) cin >> x;
    for(ll &x : b) cin >> x;
    reverse(b.begin(), b.end());
    ll ans = 0;
    for(int i = 0; i < n + m - 1; ++i) ans += min(a[i], b[i]);
    cout << ans << "\n";
}

void solve_bf_1010() {
    int p = n + m - 1;
    vector<ll> a(p, 0);
    vector<ll> b(p, 0);
    for(ll &x : a) cin >> x;
    for(ll &x : b) cin >> x;
    vector<vector<bool> > colored(1 + n, vector<bool> (1 + m, false));
    vector<bool> chosen(p, false);
    vector<bool> paid(p, false);
    ll ans = INT_MAX, cur = 0;
    for(int mask = 0; mask < (1 << p); ++mask) {
        cur = 0;
        for(int i = 0; i < p; ++i) {
            if(mask & (1 << i)) {
                chosen[i] = true;
                cur += a[i];
            } else {
                chosen[i] = false;
            }
        }
        for(int i = 0; i < p; ++i) {
            if(chosen[i]) {
                int diff = m - 1 - i;
                int y = m - i;
                int x = y - diff;
                if(y <= 0) {
                    int z = 1 - y;
                    x += z;
                    y += z;
                }
                while(x <= n && y <= m) {
                    colored[x][y] = true;
                    ++x;
                    ++y;
                }
            }
        }
        for(int i = 1; i <= n; ++i) {
            for(int j = 1; j <= m; ++j) {
                if(!colored[i][j]) {
                    paid[i + j - 2] = true;
                }
            }
        }
        for(int i = 0; i < p; ++i) {
            if(paid[i]) {
                cur += b[i];
            }
        }
        ans = min(ans, cur);
        chosen.assign(p, false);
        paid.assign(p, false);
        colored.assign(1 + n, vector<bool> (1 + m, false));
    }
    cout << ans << "\n";
}

void solve() {
    cin >> n >> m;
    if(n == 1) {
        solve_n_1();
        return;
    }
    if(n <= 20 && m <= 20) {
        solve_bf_1010();
        return;
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 20
• Subtask 5: 10 / 10
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20