Submission #1083209

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083209		Malix	Sorting (IOI15_sorting)	C++14	20 / 100	1 ms	348 KiB

sorting

#include "sorting.h"
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int,int> pi;
typedef vector<pi> pii;
typedef tuple<int,int,int> tii;
typedef vector<ll> li;
typedef vector<li> lii;
 
#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define LSOne(s) ((s)&(-s))
 
ll INF=1000000000000000010;
int inf=1e9+10;
ll M=1e9+7;

int findSwapPairs(int n, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    vi a(n),b(n);
    if(n==1)return 0;
    int ans=0;
    REP(i,0,n)a[S[i]]=i;
    REP(i,0,n)b[i]=S[i];
    int pos=0;
    for(int i=n-1;i>=0;i--){
        if(Y[0]==1){    
            swap(b[a[0]],b[a[1]]);
            swap(a[0],a[1]);
          if(i==0&&a[i]==i){
            ans++;
            P[pos]=0;
            Q[pos]=0;
            break;
        }
        }
        
        if(a[i]==i)continue;
        ans++;
        P[pos]=i;
        Q[pos]=a[i];
        pos++;
        swap(b[i],b[a[i]]);
        int x=b[a[i]];
        int y=a[i];
        a[i]=i;
        a[x]=y;
    }
    return ans;
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:24:39: warning: declaration of 'M' shadows a global declaration [-Wshadow]
   24 | int findSwapPairs(int n, int S[], int M, int X[], int Y[], int P[], int Q[]) {
      |                                   ~~~~^
sorting.cpp:22:4: note: shadowed declaration is here
   22 | ll M=1e9+7;
      |    ^
sorting.cpp:24:39: warning: unused parameter 'M' [-Wunused-parameter]
   24 | int findSwapPairs(int n, int S[], int M, int X[], int Y[], int P[], int Q[]) {
      |                                   ~~~~^
sorting.cpp:24:46: warning: unused parameter 'X' [-Wunused-parameter]
   24 | int findSwapPairs(int n, int S[], int M, int X[], int Y[], int P[], int Q[]) {
      |                                          ~~~~^~~

• Subtask 1: 8 / 8
• Subtask 2: 12 / 12
• Subtask 3: 0 / 16
• Subtask 4: 0 / 18
• Subtask 5: 0 / 20
• Subtask 6: 0 / 26