Submission #416517

#	Time	Username	Problem	Language	Result	Execution time	Memory
416517		victoriad	Sorting (IOI15_sorting)	C++14	20 / 100	1 ms	332 KiB

sorting

#include "sorting.h"
#include "vector"
using namespace std;
int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
	vector<int>c(N);
	int r=0;
	for(int i=0;i<N;i++){
		c[S[i]]=i;
	}
	if(Y[0]==0){
	for(int i=0;i<N;i++){
		if(S[i]!=i){
			P[r]=i;
			Q[r]=c[i];
			int x=S[i];
			S[c[i]]=x;
			c[x]=c[i];
			r++;
		}
	}
	}
	else{
		swap(S[1],S[0]);
		swap(c[S[1]],c[S[0]]);
		if(S[1]!=0){
		P[r]=c[0];
		Q[r]=1;
		int x=S[1];
        S[1]=0;
		S[c[0]]=x;
		c[x]=c[0];
        c[0]=1;
		r++;
		}
		swap(S[1],S[0]);
		swap(c[S[1]],c[S[0]]);
		for(int i=1;i<N;i++){
		if(S[i]!=i){
			P[r]=i;
			Q[r]=c[i];
			int x=S[i];
            S[i]=i;
			S[c[i]]=x;
			c[x]=c[i];
			c[i]=i;
			r++;
			if(i!=N-1){
				swap(S[1],S[0]);
				swap(c[S[1]],c[S[0]]);
			}
		}
		}

		if(S[0]!=0){
			P[r]=0;
			Q[r]=1;
			r++;
		}

	}
	return r;
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:4:39: warning: unused parameter 'M' [-Wunused-parameter]
    4 | int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
      |                                   ~~~~^
sorting.cpp:4:46: warning: unused parameter 'X' [-Wunused-parameter]
    4 | 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