POJ3273-Monthly Expense-二分答案

#include <cstdio>
#include <algorithm>

using namespace std;

int n,m,money[100100];

int judge(int mid)
{
int group = 1,sum = 0;
for(int i=0;i<n;i++)
{
if(sum+money[i] <= mid)
{
sum += money[i];
}
else
{
group++;
sum = money[i];
}
}

if(group > m)
return false;
else
return true;
}

int main()
{
while(~scanf("%d%d",&n,&m))
{
int low=0,high=0;
for(int i=0;i<n;i++)
{
scanf("%d",&money[i]);
high += money[i];
low = max(low,money[i]);
}
int mid = (low+high)/2;

while(low < high)
{
if(!judge(mid))
low = mid+1;
else high = mid-1;

mid = (low+high)/2;
}
printf("%d\n",mid);
}
}