Submission #716558

#	Time	Username	Problem	Language	Result	Execution time	Memory
716558		penguin133	Dango Maker (JOI18_dango_maker)	C++17	13 / 100	1 ms	340 KiB

dango_maker

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

#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int n, m, dp[3005][3005], fl[3005][3005], fr[3005][3005];
char G[3005][3005];
int par[9000005];
pi sz[9000005];

inline int conv(int i, int j){
	return (i - 1) * m + j;
}

int getr(int x){
	return (par[x] == x ? x : par[x] = getr(par[x]));
}

void merge(int a, int b){
	a = getr(a), b = getr(b);
	if(a == b)return;
	sz[a].fi += sz[b].fi, sz[a].se += sz[b].se;
	par[b] = a;
}
void solve(){
	cin >> n >> m;
	for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)cin >> G[i][j], par[conv(i, j)] = conv(i, j);
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			if(G[i][j] == 'R' && G[i][j+1] == 'G' && G[i][j+2] == 'W'){
				int x = conv(i, j);
				merge(x, x+1);
				merge(x, x+2);
				sz[getr(x)].fi++;
			}
			if(G[i][j] == 'R' && G[i+1][j] == 'G' && G[i+2][j] == 'W'){
				int x = conv(i, j);
				merge(x, x+m);
				merge(x, x+m*2);
				sz[getr(x)].se++;
			}
		}
	}
	int ans = 0;
	for(int i=1;i<=n*m;i++){
		ans += max(sz[getr(i)].fi, sz[getr(i)].se);
		sz[getr(i)] = {0, 0};
	}
	cout << ans;
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message (stderr)

dango_maker.cpp:60:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   60 | main(){
      | ^~~~

• Subtask 1: 13 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 67