제출 #1030418

#제출 시각아이디문제언어결과실행 시간메모리
1030418AlgorithmWarriorArranging Shoes (IOI19_shoes)C++14
50 / 100
180 ms278516 KiB
#include "shoes.h" #include <cstdio> #include <cassert> #include <vector> #include <deque> #include <cmath> #define MAX 100005 using namespace std; int aib[MAX]; int ub(int x) { return x&(-x); } void add(int poz) { for(;poz<MAX;poz+=ub(poz)) ++aib[poz]; } int sum(int poz) { int s=0; for(;poz;poz-=ub(poz)) s+=aib[poz]; return s; } deque<int>left[MAX]; deque<int>right[MAX]; long long count_swaps(vector<int> s) { int ind=0; long long rasp=0; for(auto i : s) { ++ind; if(i<0) left[-i].push_back(ind); else right[i].push_back(ind); int abss=abs(i); if(!left[abss].empty() && !right[abss].empty()) { int indd=left[abss].front(); left[abss].pop_front(); rasp+=indd-1-sum(indd-1); add(indd); indd=right[abss].front(); right[abss].pop_front(); rasp+=indd-1-sum(indd-1); add(indd); } } return rasp; }
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