http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=3618

很蛋疼，用cin輸入字母竟然TLE！！！

#include<iostream>
#include<vector>
#include<map>
#include<stack>
#include<algorithm>
#include<queue>
#include<list>
#include<set>
#include<string.h>
#include<stdlib.h>
#include<math.h>
#include<stdio.h>
#include<ctype.h>
#include<iomanip>

using namespace std;

#define LL long long
#define pi acos(-1)
#define N 100010
#define INF 999999999
#define eps 1e-8
//****************************************
//zoj 3279
//
 
[email protected] All rights reserved.
//****************************************

int level[N],tree[N];
int n;
int lowbit(int t)
{
    return t&(-t);
}
void update(int pos,int num)
{
    while(pos<=n)
    {
        tree[pos]+=num;
        pos+=lowbit(pos);
    }
}
int sum(int i)
{
    int tot=0;
    while(i>0)
    {
        tot+=tree[i];
        i-=lowbit(i);
    }
    return tot;
}
int find(int a)
{
    int i,j,k;
    int low=1,up=n,mid;
    while(low<=up)
    {
        mid=(low+up)>>1;
        if(sum(mid)>=a)
        {
            up=mid-1;
        }
        else
        low=mid+1;
    }
    return low;
}

char str[10];
char c[100];
int main()
{
    //freopen("a.txt","r",stdin);
    while(scanf("%d",&n)!=EOF)
    {
        int i;
        for(i=0;i<=n;i++)tree[i]=0;
        for(i=1;i<=n;i++)
        {
            scanf("%d",&level[i]);
            update(i,level[i]);
        }
        int m;
        scanf("%d",&m);
        while(m--)
        {
            scanf("%s",str);
            if(str[0]=='p')
            {
                int a,b;
                scanf("%d%d",&a,&b);
                update(a,-level[a]);
                level[a]=b;
                update(a,level[a]);
            }
            if(str[0]=='q')
            {
                int a;
                scanf("%d",&a);
                printf("%d\n",find(a));
            }
        }
    }
    return 0;
}