矩阵[雅礼集训 2017 Day1]

#include<bits/stdc++.h>
#define N 1007
int f[N][N],sum,ans,Ha,bo,n,Ans;
#define MARICLE __attribute__((optimize("-O3")))
char ch,mp[N][N];
using namespace std;
MARICLE void write(int x) {if (x<10) {putchar(‘0‘+x);return;} write(x/10); putchar(‘0‘+x%10);}
MARICLE inline void writeln(int x) {if (x<0) putchar(‘-‘),x*=-1; write(x); putchar(‘\n‘);}
MARICLE int main () {
//  freopen("a.in","r",stdin);
    scanf("%d\n",&n);
    for (int i=1; i<=n; ++i) scanf("%s", mp[i]+1);
    for (int i=1;i<=n;i++) for (int j=1;j<=n;j++) f[i][j]=(mp[i][j]==‘#‘),sum+=f[i][j];
    Ans=1e9;
    if (!sum) {writeln(-1);return 0;}
    for (int i=1;i<=n;i++) {bo=1;
      for (int j=1;j<=n;j++) bo&=f[j][i];
      Ha+=1-bo;
     }
    for (int i=1;i<=n;i++) {
        ans=0;bo=0;
        for (int j=1;j<=n;j++) ans+=f[i][j],bo|=f[j][i];
        ans=n-ans;
        if (!ans) {Ans=0;break;}
        Ans=min(ans+1-bo,Ans);
    }
    writeln(Ans+Ha);return 0;
}