Submission #630886

#	Time	Username	Problem	Language	Result	Execution time	Memory
630886		Abrar_Al_Samit	Dango Maker (JOI18_dango_maker)	C++17	100 / 100	273 ms	53408 KiB

dango_maker

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

const int MX = 3005;

int dango[MX][MX];
char a[MX][MX];
int dp[MX][3];
int n, m;
void PlayGround() {
  cin>>n>>m;
  for(int i=1; i<=n; ++i) {
    for(int j=1; j<=m; ++j) {
      cin>>a[i][j];
    }
  }

  for(int i=1; i<=n; ++i) {
    for(int j=1; j<=m; ++j) {
      if(i+2<=n && a[i][j]=='R' && a[i+1][j]=='G' && a[i+2][j]=='W') {
        dango[i][j] |= 1;
      }
      if(j+2<=m && a[i][j]=='R' && a[i][j+1]=='G' && a[i][j+2]=='W') {
        dango[i][j] |= 2;
      }
    }
  }
  int ans = 0;
  for(int S=2; S<=n+m; ++S) {
    memset(dp, 0, sizeof dp);
    int mx = 0;
    for(int i=n; i>0; --i) if(S-i>=1 && S-i<=m) {
      if(dango[i][S-i]&1) {
        dp[i][0] = 1+dp[i+1][2];
      }
      if(dango[i][S-i]&2) {
        dp[i][0] = max(dp[i][0], 1+dp[i+1][0]);
      }
      dp[i][0] = max(dp[i][0], dp[i+1][0]);
      for(int res : {1, 2}) {
        dp[i][res] = dp[i+1][res-1];
        if(dango[i][S-i]&1) {
          dp[i][res] = max(dp[i][res], 1+dp[i+1][2]);
        }
      }
      mx = max(mx, *max_element(dp[i], dp[i]+3));
    } 
    ans += mx;
  }

  cout<<ans<<'\n';
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  PlayGround();
  return 0;
}

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