oj.uz

Submission #282405

# Submission time Handle Problem Language Result Execution time Memory
282405 2020-08-24T12:00:15 Z AMO5 Emacs (COCI20_emacs) C++17
50 / 50
 1 ms 384 KB 
#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define eb emplace_back
#define mt make_tuple
#define all(x) (x).begin(), (x).end()  
#define sz(x) int(x.size()) 
#define MOD 1000000007

typedef long long ll;
typedef pair <int, int> ii;
typedef pair <ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef long double ld;

const ll INF=63;
const int mxn=200;
bool DEBUG=0;

const int dx[]={-1,0,1,0};
const int dy[]={0,-1,0,1};
string grid[mxn];
bool vis[mxn][mxn];
int n,m;

bool check(int x, int y){
	return 0<=x&&x<n&&0<=y&&y<=m;
}

void bfs(int x, int y){
	queue<ii>q;
	q.emplace(x,y);
	while(!q.empty()){
		x=q.front().fi;
		y=q.front().se;
		q.pop();
		if(vis[x][y])continue;
		vis[x][y]=1;
		for(int k=0; k<4; k++){
			int X=x+dx[k];
			int Y=y+dy[k];
			if(check(X,Y)&&!vis[X][Y]&&grid[X][Y]=='*'){
				q.emplace(X,Y);
			}
		}
	}
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    //freopen("input.txt","r",stdin); freopen("output.txt","w",stdout);
    cin>>n>>m;
    for(int i=0; i<n; i++)cin>>grid[i];
    int cnt=0;
    for(int i=0; i<n; i++){
		for(int j=0; j<m; j++){
			if(!vis[i][j]&&grid[i][j]=='*'){
				bfs(i,j);
				cnt++;
			}
		}
	}
	cout<<cnt;
}
	
// READ & UNDERSTAND
// ll, int overflow, array bounds, memset(0)
// special cases (n=1?), n+1 (1-index)
// do smth instead of nothing & stay organized
// WRITE STUFF DOWN

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct