区间更新：
//CODE CJOJ 1404
1 #include<cstdio> 2 #include<iostream> 3 #include<cstring> 4 #define ll long long 5 using namespace std; 6 ll c[100005],c1[100005],d[100005]; //d是贡献值，C是贡献值的树状数组，C1是贡献值乘以I的树状数组 7 ll sum[100005]; 8 int n,q; 9 int lowbit(int x){ 10 return x&(-x); 11 } 12 void add1(int x,ll zhi){ 13 for(int i=x;i<=n;i+=lowbit(i)) 14 c[i]+=zhi; 15 } 16 void add2(int x,ll zhi){ 17 for(int i=x;i<=n;i+=lowbit(i)) 18 c1[i]+=zhi; 19 } 20 ll getsum1(int x){ 21 ll ret=0; 22 for(int i=x;i>0;i-=lowbit(i)) 23 ret+=c[i]; 24 return ret; 25 } 26 ll getsum2(int x){ 27 ll ret=0; 28 for(int i=x;i>0;i-=lowbit(i)) 29 ret+=c1[i]; 30 return ret; 31 } 32 void add(int x,int y,ll w){ 33 d[x]+=w; 34 d[y+1]-=w; 35 add1(x,w);; 36 add1(y+1,-w); 37 add2(x,(ll)x*w); 38 add2(y+1,(ll)-(y+1)*w); 39 } 40 int main(){ 41 freopen("shulieb.in","r",stdin); 42 freopen("shulieb.out","w",stdout); 43 scanf("%d",&n); 44 for(int i=1;i<=n;i++){ 45 register int x; 46 scanf("%d",&x); 47 sum[i]+=sum[i-1]+x; 48 } 49 scanf("%d",&q); 50 for(int i=1;i<=q;i++){ 51 register char a[10]; 52 scanf("%s",a); 53 if(a[0]=='A'){ 54 register int x,y; 55 ll w; 56 scanf("%d%d%lld",&x,&y,&w); 57 add(x,y,w); 58 } else{ 59 register int x; 60 scanf("%d",&x); 61 ll xx=sum[x]+(ll)(x+1)*getsum1(x)-getsum2(x); 62 ll yy=sum[x-1]+(ll)x*getsum1(x-1)-getsum2(x-1); 63 printf("%lld ",(ll)xx-yy); 64 } 65 } 66 }
二维树状数组：
1 //CJOJ 1294 2 #include<cstdio> 3 #include<cstring> 4 #include<algorithm> 5 #include<iostream> 6 using namespace std; 7 int lowbit(int x){ 8 return x&(-x); 9 } 10 int n; 11 int c[1030][1030]; 12 void add(int x,int y,int z){ 13 for(int i=x;i<=n;i+=lowbit(i)) 14 for(int j=y;j<=n;j+=lowbit(j)) 15 c[i][j]+=z; 16 } 17 int jisuan(int x,int y){ 18 int tot=0; 19 for(int i=x;i>0;i-=lowbit(i)) 20 for(int j=y;j>0;j-=lowbit(j)) 21 tot+=c[i][j]; 22 return tot; 23 } 24 int main(){ 25 freopen("1.in","r",stdin); 26 freopen("1.out","w",stdout); 27 int type; 28 while(scanf("%d",&type)!=EOF&&type!=3){ 29 //lowbit(0)会死循环！！！需将坐标都转化到（1-N中去） 30 if(type==0) scanf("%d",&n); 31 else if(type==1){ 32 register int x,y,a; 33 scanf("%d%d%d",&x,&y,&a); 34 x++,y++; 35 add(x,y,a); 36 } else if(type==2){ 37 register int x1,x2,y1,y2; 38 scanf("%d%d%d%d",&x1,&y1,&x2,&y2); 39 x1++,x2++,y1++,y2++; 40 printf("%d ",jisuan(x2,y2)-jisuan(x2,y1-1)-jisuan(x1-1,y2)+jisuan(x1-1,y1-1)); 41 } 42 } 43 }