Submission #415332

#	Time	Username	Problem	Language	Result	Execution time	Memory
415332		meatrow	Dango Maker (JOI18_dango_maker)	C++17	100 / 100	506 ms	123844 KiB

dango_maker

// #pragma GCC target ("avx2")
// #pragma GCC optimization ("O3")
#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;

const int MOD = 1e9 + 7;

ll binpow(ll a, ll p, int mod = MOD) {
    ll res = 1;
    while (p) {
        if (p & 1) {
            (res *= a) %= mod;
        }
        p >>= 1;
        (a *= a) %= mod;
    }
    return res;
}

ll gcd(ll a, ll b) {
    return b == 0 ? a : gcd(b, a % b);
}

const int N = 3005;

int dp[N][N][3];
char a[N][N];

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

    vector<int> last(3);
    for (int s = 0; s < n + m - 1; s++) {
        last[0] = max({last[0], last[1], last[2]});
        for (int i = 0; i < min(n, s + 1); i++) {
            int j = s - i;
            if (j < 0 || j >= m) continue;
            dp[i][j][0] = *max_element(last.begin(), last.end());
            if (i && a[i - 1][j] == 'R' && a[i][j] == 'G' && a[i + 1][j] == 'W') 
                dp[i][j][1] = max(last[0], last[1]) + 1;
            if (j && a[i][j - 1] == 'R' && a[i][j] == 'G' && a[i][j + 1] == 'W') 
                dp[i][j][2] = max(last[0], last[2]) + 1;
            last = {dp[i][j][0], dp[i][j][1], dp[i][j][2]};
        }
    }

    cout << *max_element(last.begin(), last.end()) << '\n';
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int T = 1;
    // cin >> T;
    for (int tc = 1; tc <= T; tc++) {
        // cout << "Case #" << tc << ": ";
        solve();
    }
    return 0;
}

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