Submission #951425

#	Time	Username	Problem	Language	Result	Execution time	Memory
951425		vjudge1	Dango Maker (JOI18_dango_maker)	C++17	100 / 100	301 ms	53524 KiB

dango_maker

#include<bits/stdc++.h>

using namespace std;

const int N = (int)3e3+7;
const long long INF = (long long)1e18+7;

int n, m, ans;
bool b[N][N], c[N][N];
char a[N][N];
vector<pair<bool, bool> > v[2*N];
int dp[N][2];

int get(vector<pair<bool, bool> > &h) {
	int t = (int)h.size();
	for(int i = 0; i < t; ++i) {
		dp[i][0]=dp[i][1]=0;
	}
	int res = 0;
	for(int i = 3; i < t; ++i) {
		dp[i][0]=dp[i-1][0];
		dp[i][1]=dp[i-1][1];
		if(h[i].first) {
			dp[i][0]=max(dp[i][0], dp[i-1][0]);
			dp[i][0]=max(dp[i][0], dp[i-1][1]);
			dp[i][0]=max(dp[i][0], dp[i-2][0]);
			dp[i][0]=max(dp[i][0], dp[i-2][1]);
			dp[i][0]++;			
		}
		if(h[i].second) {
			dp[i][1]=max(dp[i][1], dp[i-1][1]);
			dp[i][1]=max(dp[i][1], dp[i-2][1]);
	   		dp[i][1]=max(dp[i][1], dp[i-3][0]);
	   		dp[i][1]++;
		}
		res=max(res, dp[i][0]);
		res=max(res, dp[i][1]);
	}
	return res;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
	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(j+2<=m && a[i][j]=='R' && a[i][j+1]=='G' && a[i][j+2]=='W') {
				b[i][j]=1;
			}
			if(i+2<=n && a[i][j]=='R' && a[i+1][j]=='G' && a[i+2][j]=='W') {
				c[i][j]=1;
			}
		}
	}
	for(int i = 1; i <= n; ++i) {
		for(int j = 1; j <= m; ++j) {
			v[i+j].push_back({b[i][j], c[i][j]});
		}
	}
	for(int i = 1; i <= n+m; ++i) {
		v[i].push_back({0, 0});
		v[i].push_back({0, 0});
		v[i].push_back({0, 0});
	}
	for(int i = 1; i <= n+m; ++i) {
		reverse(v[i].begin(), v[i].end());
		ans += get(v[i]);
	}
	cout << ans;
    return 0;
}                   

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