This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define f first
#define s second
#define pb push_back
const int N=1e3+5;
int n,k,a[N][N],c[N],r[N],t,tmp;
char ch;
pair<int,int> mr,mc;
priority_queue< pair<int,int> > q[2];
int main(){
cin.tie(NULL);
cout.tie(NULL);
ios_base::sync_with_stdio(false);
cin>>n>>k;
for(int i=0;i<n;i++)
for(int j=0;j<n;j++){
cin>>ch;
a[i][j]=(ch=='o');
if(a[i][j]) t++;
}
for(int i=0;i<n;i++){
tmp=0;
for(int j=0;j<n;j++)
if(a[i][j]) tmp++;
r[i]=tmp;
}
for(int j=0;j<n;j++){
tmp=0;
for(int i=0;i<n;i++)
if(a[i][j]) tmp++;
c[j]=tmp;
}
for(int i=0;i<2*n && t>k ;i++){
//cout<<t<<'\n';
mr= {r[0],0}; mc={c[0],0};
for(int j=0;j<n;j++){
if(r[j]>mr.f)
mr={r[j],j};
if(c[j]>mc.f)
mc={c[j],j};
}
if(mr.f>mc.f){
int row=mr.s;
for(int j=0;j<n;j++){
if(a[row][j]){
r[row]--;
c[j]--;
t--;
}
else{
r[row]++;
c[j]++;
t++;
}
a[row][j]=(!a[row][j]);
}
}
else{
int col=mc.s;
for(int j=0;j<n;j++){
if(a[j][col]){
r[j]--;
c[col]--;
t--;
}
else{
r[j]++;
c[col]++;
t++;
}
a[j][col]=(!a[j][col]);
}
}
}
if(t<=k)
cout<<"DA\n";
else
cout<<"NE\n";
return 0;
}
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