제출 #1023309

#제출 시각아이디문제언어결과실행 시간메모리
1023309inesfiArranging Shoes (IOI19_shoes)C++17
100 / 100
249 ms275060 KiB
#include<bits/stdc++.h> using namespace std; const int MAXI = 200*1000 + 10; queue<int> occ[2*MAXI]; bool dejaVu[MAXI]; const long long DECA = 1<<20; int arbre[2*DECA]; void modif(int pos){ pos+=DECA; arbre[pos] = 1; while(pos>1){ pos/=2; arbre[pos] = arbre[2*pos] + arbre[2*pos+1]; } } int calcSomme(int deb, int fin){ if(deb==fin) return arbre[deb]; if(deb%2==1) return arbre[deb] + calcSomme(deb+1, fin); if(fin%2==0) return calcSomme(deb, fin-1) + arbre[fin]; return calcSomme(deb/2, fin/2); } long long count_swaps(vector<signed> s) { int nb = s.size(); for(int c=0; c<nb; c++){ occ[MAXI + s[c]].push(c); } long long res = 0; for(int g=0; g<nb; g++){ if(!dejaVu[g]){ int d = occ[MAXI - s[g]].front(); occ[MAXI - s[g]].pop(); occ[MAXI + s[g]].pop(); dejaVu[d] = true; if(s[g] < 0){ // si chaussure gauche res += d-g-1; } else{ // si chaussure droite res+= d-g; } res -= calcSomme(g+DECA, d+DECA); modif(d); } } return res; }
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