제출 #153779

#제출 시각아이디문제언어결과실행 시간메모리
153779asifthegreatArranging Shoes (IOI19_shoes)C++14
50 / 100
1070 ms1928 KiB
#include <bits/stdc++.h> using namespace std; #include "shoes.h" const int N = 300000; long long count_swaps(std::vector<int> s) { int n = s.size(); int papa = n/2; bool ok = true; for(int i = 0; i < papa;i++){ if(s[i] == -s[i+n] and s[i] < 0)continue; ok = false;break; } if(ok){ n/=2ll; return (long long)(n*(n-1))/2ll; } int cnt = 0; for(int i = 0; i < n;i+=2){ int k = -69; for(int j = i+1; j < n;j++){ if(s[i] == -s[j]){k = j;break;} } // printf("for %d, we found %d\n",i,k); while(k != i+1){ swap(s[k],s[k-1]); k--; cnt++; } if(s[i] > 0){ swap(s[i],s[i+1]);cnt++; } } return cnt; } // int main() { // int n; // scanf("%d", &n); // vector<int> S(2 * n); // for(int i = 0; i < 2 * n; i++) // scanf("%d", &S[i]); // long long result = count_swaps(S); // printf("%lld\n", result); // return 0; // }
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