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Cod sursa(job #885211)
#include <fstream>
using namespace std;
ifstream f("teren.in");
ofstream g("teren.out");
int a[301][301],b[310],nr,st,dr,i,j,m,n,x;
int main()
{
f>>n>>m>>x;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++){
f>>a[i][j];
a[i][j]+=a[i-1][j];
}
int max=0;
for(i=1;i<=n;i++){
for(j=i;j<=n;j++){
st=1;nr=0;
for(dr=1;dr<=m;dr++){
b[dr]=a[j][dr]-a[i-1][dr];
nr+=b[dr];
while(nr>x&&st<dr){
nr-=b[st];
st++;
}
if((j-i+1)*(dr-st+1)>max&&nr<=x)
max=(j-i+1)*(dr-st+1);
}
}
}
g<<max;
return 0;
}