Submission #1187775

#	Time	Username	Problem	Language	Result	Execution time	Memory
1187775		M_W_13	Dango Maker (JOI18_dango_maker)	C++20	100 / 100	216 ms	26884 KiB

dango_maker

#include <bits/stdc++.h>

using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
typedef long long ll;
#define pb push_back
#define st first
#define nd second

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n, m;
    cin >> n >> m;
    char T[n][m];
    bool czy[n][m][2];
    rep(i, n) {
        rep(j, m) {
            cin >> T[i][j];
            czy[i][j][0] = false;
            czy[i][j][1] = false;
            if (j >= 2 && T[i][j - 2] == 'R' && T[i][j - 1] == 'G' && T[i][j] == 'W') {
                czy[i][j][0] = true;
            }
            if (i >= 2 && T[i - 2][j] == 'R' && T[i - 1][j] == 'G' && T[i][j] == 'W') {
                czy[i][j][1] = true;
            }
        }
    }
    int dp[n + 1][3];
    int ans = 0;
    for (int s = 0; s < n + m - 1; s++) {
        dp[0][0] = 0;
        dp[0][1] = 0;
        dp[0][2] = 0;
        // cout << "s = " << s << '\n';
        rep(x, n) {
            int y = s - x;
            dp[x + 1][0] = dp[x][0];
            dp[x + 1][1] = dp[x][0];
            dp[x + 1][2] = dp[x][1];
            if (y >= m) {
                continue;
            }
            if (y < 0) {
                // cout << "ile = " << dp[x][0] << '\n';
                ans += dp[x][0];
                break;
            }
            if (czy[x][y][0]) {
                dp[x + 1][0]++;
            }
            if (czy[x][y][1]) {
                dp[x + 1][1] = max(dp[x + 1][1], dp[x][2] + 1);
                dp[x + 1][2] = max(dp[x + 1][2], dp[x][2] + 1);
            }
            dp[x + 1][0] = max(dp[x + 1][0], max(dp[x + 1][1], dp[x + 1][2]));
        }
        if (s >= n - 1) {
            // cout << "ile = " << dp[n][0] << '\n';
            ans += dp[n][0];
        }
    }
    cout << ans << '\n';
	return 0;
}

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