POJ 3273 Monthly Expense

#include <iostream>
using namespace std;
int main()
{
int i, n, m, p, q, mid, t,s, d[100000];
scanf("%d %d", &n, &m);
for(q=p=i=0;i<n;i++)
{
scanf("%d",d+i);
if(i<=n-m)q+=d[i];
if(p<d[i])p=d[i];
}
while(p<q)
{
mid=(p+q)/2;
for(s=i=0,t=1;i<n;i++)
if(s+d[i]>mid){t++,s=d[i];}
else s+=d[i];
if(t<=m)q=mid;
else p=mid+1;
}
printf("%d\n", p);
return 0;
}