42 lines
539 B
C++
42 lines
539 B
C++
// luogu-judger-enable-o2
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#include<cstdio>
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const int maxn=500005;
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inline int lowbit(int x) { return x&-x; }
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int n,m;
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int a[maxn];
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inline void add(int x,int v)
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{
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while(x<=n)
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{
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a[x]+=v;
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x+=lowbit(x);
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}
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}
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inline int sum(int x)
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{
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int res=0;
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while(x>0)
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{
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res+=a[x];
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x-=lowbit(x);
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}
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return res;
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}
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int cmd,x,y;
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int main()
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{
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scanf("%d%d",&n,&m);
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for(int i=1;i<=n;i++)
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{
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scanf("%d",&x);
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add(i,x);
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}
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while(m-->0)
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{
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scanf("%d%d%d",&cmd,&x,&y);
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if(cmd==1) add(x,y);
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else printf("%d\n",sum(y)-sum(x-1));
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}
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return 0;
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}
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