Submission #199943

#	Time	Username	Problem	Language	Result	Execution time	Memory
199943		nvmdava	Dango Maker (JOI18_dango_maker)	C++17	100 / 100	289 ms	9372 KiB

dango_maker

#include <bits/stdc++.h>
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define ll long long
#define ff first
#define ss second
#define N 3005
#define MOD 1000000007

char c[N][N];

bool in[N][2];
int dp[N][4];

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n, m;
    cin>>n>>m;
    for(int i = 1; i <= n; ++i){
        for(int j = 1; j <= m; ++j){
            cin>>c[i][j];
        }
    }
    int res = 0;
    for(int s = 2; s <= n + m; ++s){
        int l = max(1, s - m);
        int r = min(n, s - 1);
        for(int i = l; i <= r; ++i){
            if(c[i][s - i] == 'R' && c[i][s - i + 1] == 'G' && c[i][s - i + 2] == 'W'){
                in[i][0] = 1;
            }
            if(c[i][s - i] == 'R' && c[i + 1][s - i] == 'G' && c[i + 2][s - i] == 'W'){
                in[i][1] = 1;
            }
        }
        memset(dp[l - 1], 0, sizeof dp[l - 1]);
        for(int i = l; i <= r; ++i){
            memset(dp[i], 0, sizeof dp[i]);
            for(int j = 0; j < 4; ++j)
                dp[i][j / 2] = max(dp[i][j / 2], dp[i - 1][j]);
            if(in[i][1]){
                for(int j = 0; j < 4; ++j)
                    dp[i][j / 2 + 2] = max(dp[i][j / 2 + 2], dp[i - 1][j] + 1);
            }
            if(in[i][0])
                dp[i][0] = max(dp[i - 1][0] + 1, dp[i][0]);
        }
        res += max(max(dp[r][0], dp[r][1]), max(dp[r][2], dp[r][3]));
        for(int i = l; i <= r; ++i){
            in[i][0] = in[i][1] = 0;
        }
    }
    cout<<res;
}

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