Submission #135285

#	Time	Username	Problem	Language	Result	Execution time	Memory
135285		Boxworld	Sorting (IOI15_sorting)	C++14	20 / 100	17 ms	860 KiB

sorting

#include "sorting.h"
#include <bits/stdc++.h>
using namespace std;

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
	int R=0;
	for (int i=0;i<N;i++)
	for (int j=i+1;j<N;j++)
	if (S[i]>S[j])R++;
	if (R==0)return 0;
    for (int i=0;i<M;i++){
        int p1,p2,start=0,ok=1;
        for (int j=0;j<N;j++)
        if (S[j]==X[i]){p1=j;break;}
        for (int j=0;j<N;j++)
        if (S[j]==Y[i]){p2=j;break;}
    //    printf("SWAP**:S[%d]=%d S[%d]=%d\nNOW:",p1,S[p1],p2,S[p2]);
        swap(S[p1],S[p2]);
     //   for (int i=0;i<N;i++)printf("%d ",S[i]);printf("\n");
        if (p1+p2==1&&S[p1]+S[p2]==1)start=2;
        for (int j=start;j<N-1;j++)
        if (S[j]!=j){
            P[i]=j;Q[i]=S[j];
     //       printf("SWAP%d:S[%d]=%d S[%d]=%d\nNOW:",i,j,S[j],S[j],S[S[j]]);
            swap(S[j],S[S[j]]);
     //       for (int i=0;i<N;i++)printf("%d ",S[i]);printf("\n");
            ok=0;
            break;
        }
        if (ok){
            if (S[0]>S[1]){
                P[i]=0;Q[i]=1;
     //           printf("SWAP%d:S[%d]=%d S[%d]=%d\nNOW:",i,0,S[0],1,S[1]);
                swap(S[0],S[1]);
     //           for (int i=0;i<N;i++)printf("%d ",S[i]);printf("\n");
                return i;
            }else {
                P[i]=0;
                Q[i]=0;
                return i;
            }
        }
    }
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:44:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
sorting.cpp:12:16: warning: 'p2' may be used uninitialized in this function [-Wmaybe-uninitialized]
         int p1,p2,start=0,ok=1;
                ^~
sorting.cpp:12:13: warning: 'p1' may be used uninitialized in this function [-Wmaybe-uninitialized]
         int p1,p2,start=0,ok=1;
             ^~

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