fork(1) download 
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int MAX_N = 2e5 + 5;
  5. const int MAX_VAL = 1e6 + 5;
  6. const int BLOCK_SIZE = 450;
  7.  
  8. struct Query{
  9.   int L, R, id;
  10.  
  11.   bool operator < (const Query &q) const{
  12.     if(L / BLOCK_SIZE != q.L / BLOCK_SIZE)
  13.       return L / BLOCK_SIZE < q.L / BLOCK_SIZE;
  14.     return R < q.R;
  15.   }
  16. } Q[MAX_N];
  17.  
  18. int a[MAX_N];
  19. int cnt[MAX_VAL];
  20. long long ans[MAX_N];
  21. long long curAns;
  22.  
  23. void Add(int x){
  24.   curAns += 1ll * a[x] * (2ll * cnt[a[x]] + 1);
  25.   cnt[a[x]]++;
  26. }
  27.  
  28. void Remove(int x){
  29.   curAns += 1ll * a[x] * (-2ll * cnt[a[x]] + 1);
  30.   cnt[a[x]]--;
  31. }
  32.  
  33. int main(){
  34.   ios_base::sync_with_stdio(0);
  35.   cin.tie(0);
  36.   cout.tie(0);
  37.  
  38.   int n, q;
  39.   cin >> n >> q;
  40.  
  41.   for(int i = 1; i <= n; i++)
  42.     cin >> a[i];
  43.  
  44.   for(int i = 1; i <= q; i++)
  45.     cin >> Q[i].L >> Q[i].R,
  46.     Q[i].id = i;
  47.  
  48.   sort(Q + 1, Q + 1 + q);
  49.  
  50.   int curL = 1, curR = 0;
  51.  
  52.   for(int i = 1; i <= q; i++){
  53.     while(curL < Q[i].L)
  54.       Remove(curL++);
  55.     while(curL > Q[i].L)
  56.       Add(--curL);
  57.     while(curR < Q[i].R)
  58.       Add(++curR);
  59.     while(curR > Q[i].R)
  60.       Remove(curR--);
  61.  
  62.     ans[Q[i].id] = curAns;
  63.   }
  64.  
  65.   for(int i = 1; i <= q; i++)
  66.     cout << ans[i] << "\n";
  67.  
  68.   return 0;
  69. }
Success #stdin #stdout 0.01s 8104KB
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https://ideone.com/IHkzzZ
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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