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a guest May 25th, 2019 71 Never
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  1. void build_tree(int m[],int v,int tl,int tr) {
  2.     if (tl==tr) tree[v]=make_pair(m[tl],tl);
  3.     else {
  4.         int tm=(tl+tr)/2;
  5.         build_tree(m,2*v,tl,tm);
  6.         build_tree(m,2*v+1,tm+1,tr);
  7.     if (tree[2*v].first>tree[2*v+1].first)  
  8.         tree[v]=make_pair(tree[2*v].first,tree[2*v].second);
  9.    
  10.     else tree[v]=make_pair(tree[2*v+1].first,tree[2*v+1].second);
  11.     }
  12. }
  13.  
  14.  
  15.  
  16. int sum(int v,int tl,int tr,int l,int r) {
  17.     if (l>r) return 0;
  18.     if (l==tl && r==tr) return tree[v];
  19.     int tm=(tl+tr)/2;
  20.     return sum(2*v,tl,tm,l,min(r,tm))+sum(2*v+1,tm+1,tr,max(l,tm+1),r);
  21. }
  22.  
  23. void update (int v, int tl, int tr, int pos, int new_val) {
  24.     if (tl == tr)
  25.         t[v] = new_val;
  26.     else {
  27.         int tm = (tl + tr) / 2;
  28.         if (pos <= tm)
  29.             update (v*2, tl, tm, pos, new_val);
  30.         else
  31.             update (v*2+1, tm+1, tr, pos, new_val);
  32.         t[v] = t[v*2] + t[v*2+1];
  33.     }
  34. }
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