Submission #1068382

#TimeUsernameProblemLanguageResultExecution timeMemory
1068382epicci23Dango Maker (JOI18_dango_maker)C++17
0 / 100
1 ms2396 KiB
#include "bits/stdc++.h"
#define all(v) v.begin() , v.end()
using namespace std;

const int INF = 1e9;
const int N = 3005;
int dp[N][N][2];
bitset<N> ch[N][2];
void _(){
  int n,m,ans=0;
  cin >> n >> m;
  for(int i=1;i<=n;i++)
    for(int j=1;j<=m;j++)
      ch[i][0][j]=ch[i][1][j]=1;
  vector<string> v;
  v.push_back("$$$");
  for(int i=0;i<n;i++){
  	string s;cin >> s;
    s="$"+s+"$";
  	v.push_back(s);
  }
  for(int i=1;i<=n;i++){
    for(int j=m;j>=1;j--){
      if(v[i][j]!='R'){
        dp[i][j][0]=dp[i][j][1]=-INF;
        ch[i][0][j]=ch[i][1][j]=0;
        continue;
      }
      bool ok0=0,ok1=0;
      if(i+2<=n && v[i+1][j]=='G' && v[i+2][j]=='W') ok0=1;
      if(j+2<=m && v[i][j+1]=='G' && v[i][j+2]=='W') ok1=1;
      if(!ok0 && !ok1){
        dp[i][j][0]=dp[i][j][1]=-INF;
        ch[i][0][j]=ch[i][1][j]=0;
        continue;
      }
      if(ok0){
        dp[i][j][0]=1;
        if(i-1>=1 && j+1<=m && v[i-1][j+1]=='R'){ 
          dp[i][j][0]=max(dp[i][j][0],max(dp[i-1][j+1][1],dp[i-1][j+1][0])+1);
          ch[i-1][1][j+1]=ch[i-1][0][j+1]=0;
        }
      }
      else{
        ch[i][0][j]=0;
        dp[i][j][0]=-INF;
      }
      if(ok1){
        dp[i][j][1]=1;
        if(i-1>=1 && j+1<=m && v[i-1][j+1]=='R'){ 
          dp[i][j][1]=max(dp[i][j][1],dp[i-1][j+1][1]+1);
          ch[i-1][1][j+1]=0;
        }
        if(i-2>=1 && j+2<=m && v[i-2][j+2]=='R'){ 
          dp[i][j][1]=max(dp[i][j][1],dp[i-2][j+2][1]+1);
          ch[i-2][1][j+2]=0;
        }
      }
      else{
        ch[i][1][j]=0;
        dp[i][j][1]=-INF;
      }
    }
  }
  for(int i=1;i<=n;i++){
    for(int j=1;j<=m;j++){
      int cur=0;
      if(ch[i][0][j]) cur=max(cur,dp[i][j][0]);
      if(ch[i][1][j]) cur=max(cur,dp[i][j][1]);
      ans+=cur;
    }
  }
  cout << ans << '\n';
}

int32_t main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tc=1;//cin >> tc;
  while(tc--) _();
  return 0;
}
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