POJ 3273 Monthly Expense (二分)

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题目地址：POJ 3273

水题。居然错了两次，sad、、

代码如下：

#include <iostream>#include <string.h>#include <math.h>#include <queue>#include <algorithm>#include <stdlib.h>#include <map>#include <set>#include <stdio.h>using namespace std;#define LL __int64#define pi acos(-1.0)const int mod=9901;const int INF=0x3f3f3f3f;const double eqs=1e-8;int a[110000];int main(){        int n, m, i, cnt, sum;        while(scanf("%d%d",&n,&m)!=EOF) {                for(i=0; i<n; i++) {                        scanf("%d",&a[i]);                }                int low=0, high=1e9, mid, ans;                while(low<=high) {                        mid=low+high>>1;                        cnt=1;                        sum=0;                        for(i=0; i<n; i++) {                                if(a[i]>mid) {                                        cnt=m+1;                                        break;                                }                                if(sum+a[i]>mid) {                                        sum=a[i];                                        cnt++;                                } else   sum+=a[i];                                if(cnt>m)  break;                        }                        if(cnt<=m) {                                ans=mid;                                high=mid-1;                        } else  low=mid+1;                }                printf("%d\n",ans);        }        return 0;}

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