bzoj1639[Usaco2007 Mar]Monthly Expense 月度开支*

 1 #include <cstdio>
 2 #include <cstring>
 3 #include <algorithm>
 4 #define maxn 100100
 5 #define inc(i,j,k) for(int i=j;i<=k;i++)
 6 using namespace std;
 7 
 8 inline int read(){
 9     char ch=getchar(); int f=1,x=0;
10     while(ch<‘0‘||ch>‘9‘){if(ch==‘-‘)f=-1; ch=getchar();}
11     while(ch>=‘0‘&&ch<=‘9‘)x=x*10+ch-‘0‘,ch=getchar();
12     return f*x;
13 }
14 int n,m,mon[maxn],l,r,ans;
15 bool check(int x){
16     int y=1,z=0;
17     inc(i,1,n){
18         if(z+mon[i]>x){y++; z=mon[i]; if(y>m)return 0;}else z+=mon[i];
19     }
20     return 1;
21 }
22 int main(){
23     n=read(); m=read(); inc(i,1,n)mon[i]=read(),l=max(l,mon[i]),r+=mon[i];
24     while(l<=r){
25         int mid=(l+r)>>1; if(check(mid))ans=mid,r=mid-1;else l=mid+1;
26     }
27     printf("%d",ans); return 0;
28 }