莫队模板题...
不过树状数组也可以做...跟HH的项链几乎一模一样，离线询问，然后记录前缀，更新的时候把前缀删掉就好了，然而这题开long long,卡空间
1 //hgs AK IOI,IMO,ICHO,IPHO 2 #include<bits/stdc++.h> 3 #define int long long 4 #define writeln(x) write(x),puts("") 5 #define writep(x) write(x),putchar(' ') 6 using namespace std; 7 inline int read(){ 8 int ans=0,f=1;char chr=getchar(); 9 while(!isdigit(chr)){if(chr=='-') f=-1;chr=getchar();} 10 while(isdigit(chr)){ans=(ans<<3)+(ans<<1)+chr-48;chr=getchar();} 11 return ans*f; 12 }void write(int x){ 13 if(x<0) putchar('-'),x=-x; 14 if(x>9) write(x/10); 15 putchar(x%10+'0'); 16 }const int M = 3e5+5; 17 int n,m,a[M],pos[M],pre[M],b[M],len,Ans[M]; 18 struct Que{int l,r,id;}q[M]; 19 bool cmp(const Que&x,const Que&y){return x.r<y.r;} 20 int s[M]; 21 #define lowbit(x) (x&-x) 22 inline void Update(int x,int y){if(x==0)return;for(;x<=n;x+=lowbit(x))s[x]+=y;} 23 inline int Query (int x){int ans=0;for(;x;x-=lowbit(x))ans+=s[x];return ans;} 24 signed main(){ 25 int Time=read(); 26 while(Time--){memset(pre,0,sizeof(pre)),memset(pos,0,sizeof(pos)); 27 n=read();for(int i=1;i<=n;++i)b[i]=a[i]=read(); 28 sort(b+1,b+n+1),len=unique(b+1,b+n+1)-b-1;memset(s,0,sizeof(s)); 29 for(int i=1;i<=n;i++)a[i]=lower_bound(b+1,b+len+1,a[i])-b,pre[i]=pos[a[i]],pos[a[i]]=i; 30 m=read();for(int i=1;i<=m;++i)q[i].l=read(),q[i].r=read(),q[i].id=i;sort(q+1,q+m+1,cmp); 31 for(int i=1,j=1;i<=m;i++){ 32 for(;j<=q[i].r;j++)Update(pre[j],-b[a[pre[j]]]),Update(j,b[a[j]]); 33 Ans[q[i].id]=Query(q[i].r)-Query(q[i].l-1); 34 }for(int i=1;i<=m;i++)printf("%lld ",Ans[i]); 35 } 36 return 0; 37 }