poj3273 二分搜索

#include<stdio.h>
#include<string.h>
int day[100040];
int main()
{
int i,j,n,m,sum,max,mid,res;
while(scanf("%d%d",&n,&m)>0)
{
sum=0;
max=-1000;
for(i=1;i<=n;i++)
{
scanf("%d",&day[i]);
sum+=day[i];
max=(max>day[i])?max:day[i];
}
while(max<sum)
{
mid=(max+sum)/2;
for(i=2,j=day[1],res=1;i<=n;i++)
if((j=j+day[i])>mid)
{
res++;
j=day[i];
}
if(res<m)
sum=mid-1;
if(res==m)
sum=mid;
if(res>m)
max=mid+1;
}
printf("%d\n",max);

}
return 0;
}