Submission #899792

#	Time	Username	Problem	Language	Result	Execution time	Memory
899792		ForgottenDestiny	Dango Maker (JOI18_dango_maker)	C++17	100 / 100	228 ms	258900 KiB

dango_maker

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

int dp[6004][3005][3];


int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n,m;
    cin >> n >> m;
    vector<string> graph(n);
    for (int i = 0; i < n; i++) {
        cin >> graph[i];
    }
    vector<vector<pair<int, int>>> skewers(n, vector<pair<int, int>>(m));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (i > 0 && i < n - 1 && graph[i][j] == 'G' && graph[i - 1][j] == 'R' && graph[i + 1][j] == 'W') {
                skewers[i][j].first = 1;
            }
            if (j > 0 && j < m - 1 && graph[i][j] == 'G' && graph[i][j - 1] == 'R' && graph[i][j + 1] == 'W') {
                skewers[i][j].second = 1;
            }
        }
    }
    for (int j = 0; j < n + m - 1; j++) {
        int curx = min(j, m-1);
        int cury = j - curx;
        while (curx >= 0 && cury < n) {
            int last=0;
             if (cury == 0) {
                    last = 0;
                } else {
                    last = max({dp[j][cury - 1][0], dp[j][cury - 1][1], dp[j][cury - 1][2]});
                }
            dp[j][cury][0] = last;
            if (skewers[cury][curx].first == 1) {
                int last = 0;
                if (cury == 0) {
                    last = 0;
                } else {
                    last = max({dp[j][cury - 1][0], dp[j][cury - 1][1], dp[j][cury - 1][2]});
                }
                dp[j][cury][0] = last;
                if (cury == 0) {
                    last = 0;
                } else {
                    last = max({dp[j][cury - 1][0], dp[j][cury - 1][1]});
                }
                dp[j][cury][1] = last + 1;
            }
            if (skewers[cury][curx].second == 1) {
                int last;
                if (cury == 0) {
                    last = 0;
                } else {
                    last = max({dp[j][cury - 1][0], dp[j][cury - 1][1], dp[j][cury - 1][2]});
                }
                dp[j][cury][0] = last;
                if (cury == 0) {
                    last = 0;
                } else {
                    last = max({dp[j][cury - 1][0], dp[j][cury - 1][2]});
                }
                dp[j][cury][2] = last + 1;
            } 
            cury++;
            curx--;
        }
    }
    long long res = 0;
    int lol = 0;
    for (int i = 0; i < n + m - 1; i++) {
        res = res+max({dp[i][lol][0], dp[i][lol][1], dp[i][lol][2]});
        lol = min(lol + 1, n-1);
    }
    cout << res << "\n";
}

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