Submission #282738

#TimeUsernameProblemLanguageResultExecution timeMemory
282738medmdgArranging Shoes (IOI19_shoes)C++14
0 / 100
0 ms384 KiB
#include <bits/stdc++.h> using namespace std; const int MAX_N=1e5+9; int a[8*MAX_N]; void build(int l,int r, int p){ if(l==r){ a[p]=l; return; } build(l,(l+r)/2,p*2); build((l+r)/2+1,r,p*2+1); a[p]=0; return; } int find(int value,int l, int r, int p){ if(l==r){ if(l==value){ return a[p]; }else{ return 0; } } a[p*2]+=a[p]; a[p*2+1]+=a[p]; a[p]=0; if(l>value||value>r){ return 0; } int x=find(value,l,(r+l)/2,p*2); if(x+1){ return x; } return find(value,(r+l)/2+1,r,p*2+1); } void update(int x,int y,int l,int r,int p){ if(l==r){ if( r<=y && r>=x ) a[p]++; return; } a[p*2]+=a[p]; a[p*2+1]+=a[p]; a[p]=0; if(r<x||l>y) return; if(r<=y&&l>=x){ a[p*2]++; a[p*2+1]++; return; } update(x,y,l,(l+r)/2,p*2); update(x,y,(l+r)/2+1,r,p*2+1); return; } long long count_swaps(std::vector<int> S){ int n=S.size()/2; long long int ans=0; build(1,n*2,1); vector<vector<int> > h(n*2+10); for(int i=0;i<n*2;i++){ if(h[S[i]*(-1)+n].size()==0){ h[(S[i]+n)].push_back(i+1); }else{ int x=find(h[S[i]*(-1)+n][0],1,2*n,1); int y=find(i+1,1,2*n,1); if(S[i]<0) ans++; ans+=y-x-1; update(h[S[i]*(-1)+n][0],i+1,1,2*n,1); h[S[i]*(-1)+n].erase(h[S[i]*(-1)+n].begin()); } } return ans; }
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