1 2 3 4 5 6 7 8 9 10 11 12 | #include<cstdio>
int main(){
int n,k,i,j,d,mn=2020;
scanf("%d%d",&n,&k);
for(i=2;i<n+2;++i)
for(j=1;j<i;++j){
scanf("%d",&d);
if(j*(i-j)<=k && mn>d)
mn=d;
}
printf("%d\n",mn);
}
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