Submission #709716

#	Time	Username	Problem	Language	Result	Execution time	Memory
709716		Baytoro	Dango Maker (JOI18_dango_maker)	C++17	100 / 100	626 ms	18076 KiB

dango_maker

#include <bits/stdc++.h>
using namespace std;
#define ios ios::sync_with_stdio(false); cin.tie(NULL);cout.tie(NULL);
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define fr first
#define sc second
#define endl '\n'
#define ll long long
#define int long long
void fopn(string name){
	freopen((name+".in").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}
const int INF=2e9,mod=1e9+7,N=2e5+10;
int dp[3005][5];
char c[3005][3005];
void solve(){
	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 ans=0;
	for(int s=2;s<=n+m;s++){
		int res=0;
		for(int i=1;i<=m;i++) dp[i][1]=dp[i][2]=0;
		for(int i=1;i<=m;i++){
			int j=s-i;
			if(j<1 || j>n) continue;
			dp[i][1]=max(dp[i-1][1],dp[i-1][2]);
			if(i>3)
				dp[i][2]=max(dp[i-1][2],dp[i-3][1]);
			if(j>2 && c[j-2][i]=='R' && c[j-1][i]=='G' && c[j][i]=='W')
				dp[i][1]=max(dp[i-1][2],dp[i-1][1])+1;
			if(i>2 && c[j][i-2]=='R' && c[j][i-1]=='G' && c[j][i]=='W')
				dp[i][2]=max(dp[i-1][2],dp[i-3][1])+1;
			res=max(res,max(dp[i][1],dp[i][2]));
		}
		ans+=res;
	}
	
	cout<<ans;
}
main(){
	//fopn("cbarn");
	//ios;
	int T=1;
	//cin>>T;
	for(int i=1;i<=T;i++){
		//cout<<"Case #"<<i<<": ";
		solve();
		//cout<<endl;
	}
}

Compilation message (stderr)

dango_maker.cpp:48:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   48 | main(){
      | ^~~~
dango_maker.cpp: In function 'void fopn(std::string)':
dango_maker.cpp:13:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dango_maker.cpp:14:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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