不知道为什么用C++输入输出死活不过，换成C的就过了。。。
#include <stdio.h>
#include <string.h> //==============================
#define maxn 50020 int c[maxn];
int a[maxn];
int n;
int t; int lowbit(int x)
{
return x&(-x);
} int Sum(int n)
{
int sum = 0;
while(n>0)
{
sum += c[n];
n = n - lowbit(n);
}
return sum;
} void update(int i,int x)
{
while(i <= n)
{
c[i] = c[i] + x;
i = i + lowbit(i);
}
} int GetSum(int x1,int x2)
{
return Sum(x2) - Sum(x1-1);
} //===================================
int main()
{
scanf("%d",&t);
int count = 0;
while(t--)
{
count++;
memset(a,0,sizeof(a));
memset(c,0,sizeof(c));
scanf("%d",&n);
for(int i = 1; i <= n; i++)
{
scanf("%d",&a[i]);
update(i,a[i]);
}
//cout<<"case "<<count<<":"<<endl;
printf("Case %d:\n",count);
char oper[11];
int i,j;
while(scanf("%s",oper)==1)
{
if(strcmp(oper,"End")==0)
break;
scanf("%d%d",&i,&j);
if(strcmp(oper,"Query")==0)
{
printf("%d\n",GetSum(i,j));
}
if(strcmp(oper,"Add")==0)
{
a[i] += j;
update(i,j);
}
if(strcmp(oper,"Sub")==0)
{
a[i] -= j;
update(i,-j);
}
}
}
return 0;
}