hdu 1166 敌兵布阵(线段树单点更新)

#include<cstring>
#include<iostream>

#define M 50005
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
/*left,right,root,middle*/

int sum[M<<2];

inline void PushPlus(int rt)
{
sum[rt] = sum[rt<<1] + sum[rt<<1|1];
}

void Build(int l, int r, int rt)
{
if(l == r)
{
scanf("%d", &sum[rt]);
return ;
}
int m = ( l + r )>>1;

Build(lson);
Build(rson);
PushPlus(rt);
}

void Updata(int p, int add, int l, int r, int rt)
{

if( l == r )
{
sum[rt] += add;
return ;
}
int m = ( l + r ) >> 1;
if(p <= m)
Updata(p, add, lson);
else
Updata(p, add, rson);

PushPlus(rt);
}

int Query(int L,int R,int l,int r,int rt)
{
if( L <= l && r <= R )
{
return sum[rt];
}
int m = ( l + r ) >> 1;
int ans=0;
if(L<=m )
ans+=Query(L,R,lson);
if(R>m)
ans+=Query(L,R,rson);

return ans;
}
int main()
{
int T, n, a, b;
scanf("%d",&T);
for( int i = 1; i <= T; ++i )
{
printf("Case %d:\n",i);
scanf("%d",&n);
Build(1,n,1);

char op[10];

while( scanf("%s",op) &&op[0]!='E' )
{

scanf("%d %d", &a, &b);
if(op[0] == 'Q')
printf("%d\n",Query(a,b,1,n,1));
else if(op[0] == 'S')
Updata(a,-b,1,n,1);
else
Updata(a,b,1,n,1);

}
}
return 0;
}