Submission #1263904

#TimeUsernameProblemLanguageResultExecution timeMemory
1263904gustavo_d정렬하기 (IOI15_sorting)C++17
20 / 100
16 ms328 KiB
#include "sorting.h" #include <bits/stdc++.h> using namespace std; const int MAXN = 2e5; int p[MAXN]; int findSwapPairs(int n, int P[], int m, int hisX[], int hisY[], int myX[], int myY[]) { int l = 0, r = m; int ans = 0; while (l <= r) { int mid = (l + r) / 2; for (int i=0; i<n; i++) p[i] = P[i]; for (int i=0; i<mid; i++) swap(p[hisX[i]], p[hisY[i]]); vector<pair<int, int>> ops(mid, make_pair(0, 0)); for (int op=0; op<mid; op++) { for (int i=0; i<n; i++) { if (p[i] != i) { int pos = 0; for (int j=i+1; j<n; j++) { if (p[j] == i) { pos = j; break; } } ops[op] = {i, pos}; swap(p[i], p[pos]); break; } } } bool check = true; for (int i=0; i<n and check; i++) { if (p[i] != i) check = false; } if (check) { r = mid-1; for (int op=0; op<mid; op++) { myX[op] = ops[op].first; myY[op] = ops[op].second; } ans = mid; } else l = mid+1; } return ans; }
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