Submission #1109046

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109046		codexistent	Dango Maker (JOI18_dango_maker)	C++14	100 / 100	343 ms	172684 KiB

dango_maker

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MAXNM 3005
#define FOR(i, a, b) for(ll i = a; i <= b; i++)

const int  N = 3005, MOD = 998244353, M = 3e6 + 12;
    
char g[N][N];
int n, m, ok[N][N][2], dp[N * 2][3];
vector<array<int, 2>> e[N * 2];

int main(){
    cin >> n >> m;
    FOR(i, 1, n){
        string s; cin >> s;
        FOR(j, 1, m) g[i][j] = s[j - 1];
    } 

    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= m; j++) {
            if(g[i][j] == 'G' && g[i][j - 1] == 'R' && g[i][j + 1] == 'W') {
                ok[i][j][0] = 1;
            }
            if(g[i][j] == 'G' && g[i - 1][j] == 'R' && g[i + 1][j] == 'W') {
                ok[i][j][1] = 1;
            }
            e[i + j].push_back({i, j});
        }
    }
    int r = 0;
    for(int i = 1; i <= n + m; i++) {
        int f = (int)e[i].size() - 1;
        if(e[i].empty()) continue;
        dp[0][0] = ok[e[i][0][0]][e[i][0][1]][0];
        dp[0][1] = ok[e[i][0][0]][e[i][0][1]][1];
        dp[0][2] = 0;
        for(int j = 1; j < (int)e[i].size(); j++)  {
            int x = e[i][j][0], y = e[i][j][1];
            dp[j][2] = max({dp[j - 1][0], dp[j - 1][1], dp[j - 1][2]});
            dp[j][0] = max(dp[j - 1][0], dp[j - 1][2]) + ok[x][y][0];
            dp[j][1] = max(dp[j - 1][1], dp[j - 1][2]) + ok[x][y][1];
        }   
 
        // cout << dp[f][1] << '\n';
        r += max({dp[f][0], dp[f][1], dp[f][2]});
    }

    cout << r << endl;
}

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