hdu 4251 The Famous ICPC Team Again(划分树)
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#include <stdio.h>#include <string.h>#include <algorithm>using namespace std;const int MAXN = 100010;int tree[20][MAXN];int sorted[MAXN];int toleft[20][MAXN];void build(int l, int r, int dep){ if(l == r) return; int mid = (l+r) >> 1; int same = mid-l+1; for(int i = l; i <= r; ++i) if(tree[dep][i] < sorted[mid]) --same; int lpos = l; int rpos = mid+1; for(int i = l; i <= r; ++i) { if(tree[dep][i] < sorted[mid]) tree[dep+1][lpos++] = tree[dep][i]; else if(tree[dep][i] == sorted[mid] && same > 0) { tree[dep+1][lpos++] = tree[dep][i]; --same; } else tree[dep+1][rpos++] = tree[dep][i]; toleft[dep][i] = toleft[dep][l-1]+lpos-l; } build(l,mid,dep+1); build(mid+1,r,dep+1);}int query(int L, int R, int l, int r, int dep, int k){ if(l == r) return tree[dep][l]; int mid = (L+R) >> 1; int cnt = toleft[dep][r]-toleft[dep][l-1]; if(cnt >= k) { int newl = L + toleft[dep][l-1]-toleft[dep][L-1]; int newr = newl+cnt-1; return query(L,mid,newl,newr,dep+1,k); } else { int newr = r + toleft[dep][R]-toleft[dep][r]; int newl = newr - (r-l-cnt); return query(mid+1,R,newl,newr,dep+1,k-cnt); }}int main(){ int n,m; int time = 0; while(scanf("%d",&n) != EOF) { memset(tree,0,sizeof(tree)); for(int i = 1; i <= n; ++i) { scanf("%d",&tree[0][i]); sorted[i] = tree[0][i]; } sort(sorted+1,sorted+1+n); build(1,n,0); scanf("%d",&m); int s,t,k; printf("Case %d:\n",++time); while(m--) { scanf("%d %d",&s,&t); k = (s+t)/2-s+1; printf("%d\n",query(1,n,s,t,0,k)); } } return 0;}
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