Submission #531186

#	Time	Username	Problem	Language	Result	Execution time	Memory
531186		zxcvbnm	Dango Maker (JOI18_dango_maker)	C++14	33 / 100	449 ms	460 KiB

dango_maker

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

constexpr int nax = 105;
char mat[nax][nax];
const string str = "RGW";

bool check_ok(int i, int j, int p) {
    string curr;
    if (p == 0) {
        for(int k = 0; k < 3 && j+k < nax; k++) {
            curr += mat[i][j+k];
        }
    }
    else {
        for(int k = 0; k < 3 && i+k < nax; k++) {
            curr += mat[i+k][j];
        }
    }
    return (curr == str);
}

void rem(int i, int j, int p) {
    if (p == 0) {
        for(int k = 0; k < 3; k++) {
            mat[i][j+k] = 'X';
        }
    }
    else {
        for(int k = 0; k < 3; k++) {
            mat[i+k][j] = 'X';
        }
    }
}

int cnt(int i, int j, int p) {
    if (p == 0) {
        for(int k = 0; k < 3; k++) {
            mat[i][j+k] = 'X';
        }
    }
    else {
        for(int k = 0; k < 3; k++) {
            mat[i+k][j] = 'X';
        }
    }

    int cnt = 0;
    for(int x = 0; x < nax; x++) {
        for(int y = 0; y < nax; y++)  {
            cnt += check_ok(x, y, 0);
            cnt += check_ok(x, y, 1);
        }
    }

    if (p == 0) {
        for(int k = 0; k < 3; k++) {
            mat[i][j+k] = str[k];
        }
    }
    else {
        for(int k = 0; k < 3; k++) {
            mat[i+k][j] = str[k];
        }
    }


    return cnt;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m;
    cin >> n >> m;
    assert(n < nax && m < nax);

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

    int ans = 0;

    while(1) {
        bool ok = false;
        int best = -1, x = -1, y = -1, p = -1;

        for(int i = 0; i < nax; i++) {
            for(int j = 0; j < nax; j++) {
                if (check_ok(i, j, 0)) {
                    ok = true;
                    int curr = cnt(i, j, 0);
                    if (curr > best) {
                        best = curr;
                        x = i, y = j, p = 0;
                    }
                }
                if (check_ok(i, j, 1)) {
                    ok = true;
                    int curr = cnt(i, j, 1);
                    if (curr > best) {
                        best = curr;
                        x = i, y = j, p = 1;
                    }
                }

            }
        }

        if (!ok) break;
        rem(x, y, p);
//        cout << x << " " << y << " " << p << "\n";
        ans++;
    }

    cout << ans << "\n";
    return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 20 / 20
• Subtask 3: 0 / 67