https://codeforces.com/contest/1182/problem/B

題解：暴力?

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=1000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v; int ans,cnt,flag,temp,sum; int a[N][N]; char str[N][N]; struct node{}; int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);//while(t--){scanf("%d%d",&n,&m);for(int i=1;i<=n;i++)scanf("%s",str[i]+1);for(int i=1;i<=n;i++){for(int j=1;j<=m;j++){if(str[i][j]=='*'&&str[i-1][j]=='*'&&str[i+1][j]=='*'&&str[i][j-1]=='*'&&str[i][j+1]=='*'){for(int k=j;k<=m;k++){if(str[i][k]!='*')break;a[i][k]=1;}for(int k=j;k>=1;k--){if(str[i][k]!='*')break;a[i][k]=1;}for(int k=i;k<=n;k++){if(str[k][j]!='*')break;a[k][j]=1;}for(int k=i;k>=1;k--){if(str[k][j]!='*')break;a[k][j]=1;}ans=1;break;}}if(ans)break;}for(int i=1;i<=n&&ans;i++){for(int j=1;j<=m&&ans;j++){if(str[i][j]=='*'&&!a[i][j]){ans=0;}}}cout<<(ans?"YES":"NO")<<endl;//}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }

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