[Usaco07Mar&luogu2884]Monthly Expense

题目链接

题解：二分搞一搞

#include <iostream>#include <cstdio>#include <climits>using namespace std;#define INF INT_MAX-1000int n,m,l,r,mid,ans;int w[100005];bool ok(int x){    int s=0,k=1;//至少要有一组     for(int i=1;i<=n;i++)    {        if(w[i]>x) return false;        s+=w[i];        if(s>x)        s=w[i],k++;    }    return k<=m;}int main(){    cin>>n>>m;    for(int i=1;i<=n;i++)    scanf("%d",&w[i]);    l=1;r=INF;    while(l<=r)    {        mid=(l+r)>>1;        if(ok(mid)) r=mid-1,ans=mid;        else l=mid+1;    }    printf("%d\n",ans);    return 0;}