제출 #800419

#제출 시각아이디문제언어결과실행 시간메모리
800419Dan4Life정렬하기 (IOI15_sorting)C++17
20 / 100
1 ms340 KiB
#include <bits/stdc++.h> using namespace std; const int N = (int)2e5+10; int n, a[N], p[N], vis[N]; bool chk(int m, int A[], int X[], int Y[], int P[], int Q[]){ for(int i = 0; i < n; i++) a[i] = A[i], vis[i]=0; for(int i = 0; i < m; i++) swap(a[X[i]],a[Y[i]]), P[i]=Q[i]=0; for(int i = 0; i < n; i++) p[a[i]]=i; int T = 0; fill(vis,vis+n,0); for(int i = 0; i < n; i++){ if(vis[i]) continue; int j = i; vector<int> v; v.clear(); while(!vis[j]){ vis[j] = 1; if(vis[p[j]]) break; P[T]=j, Q[T]=p[j], j = p[j]; swap(p[a[P[T]]],p[a[Q[T]]]); swap(a[P[T]],a[Q[T]]), T++; } } return T<=m; } int findSwapPairs(int N, int A[], int m, int X[], int Y[], int P[], int Q[]) { n = N; if(is_sorted(A,A+n)) return 0; for(int i = 0; i < n; i++) a[i]=A[i]; int l = 0, r = m; while(l<r){ int mid = (l+r)/2; if(chk(mid,A,X,Y,P,Q)) r=mid; else l=mid+1; } chk(l,A,X,Y,P,Q); return l; }

컴파일 시 표준 에러 (stderr) 메시지

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:24:23: warning: declaration of 'N' shadows a global declaration [-Wshadow]
   24 | int findSwapPairs(int N, int A[], int m, int X[], int Y[], int P[], int Q[]) {
      |                   ~~~~^
sorting.cpp:3:11: note: shadowed declaration is here
    3 | const int N = (int)2e5+10;
      |           ^
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