Submission #421247

#	Time	Username	Problem	Language	Result	Execution time	Memory
421247		Pbezz	Sorting (IOI15_sorting)	C++14	20 / 100	4 ms	332 KiB

sorting

#include "sorting.h"
#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define pb push_back
typedef pair<ll,ll> pii;

const ll MAXN=2e5+5;
const ll INF=1e9+7;



int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
	int i,k,j,R=0;
	bool ok=true;

	for(i=0;i<N;i++){
	if(S[i]!=i)ok=false;
	}

	if(ok)return 0;

if(Y[0]==1){//cout<<"haha1";
swap(S[0],S[1]); bool f=false;

if(S[0]==0&&S[1]!=1){

for(k=0;k<N;k++){
if(S[k]==1)break;
}

P[0]=k;
Q[0]=1;
R++;
swap(S[k],S[1]);
	ok=true;
	for(j=0;j<N;j++){
	if(S[j]!=j)ok=false;
	}
	if(ok){
	return R;
	}
swap(S[0],S[1]);

}else if(S[0]!=0&&S[1]==1){

for(k=0;k<N;k++){
if(S[k]==0)break;
}

P[0]=k;
Q[0]=0;
R++;
swap(S[k],S[0]);
	ok=true;
	for(j=0;j<N;j++){
	if(S[j]!=j)ok=false;
	}
	if(ok){
	return R;
	}
swap(S[0],S[1]);

}else if(S[0]!=0&&S[1]!=1){f=true;

for(k=0;k<N;k++){
if(S[k]==0)break;
}

P[0]=k;
Q[0]=1;
R++;
swap(S[k],S[1]);

	ok=true;
	for(j=0;j<N;j++){
	if(S[j]!=j)ok=false;
	}
	if(ok){
	return R;
	}
swap(S[0],S[1]);
//0 in place

	if(S[1]!=1){f=true; 

for(k=0;k<N;k++){
if(S[k]==1)break;
}

P[R]=k;
Q[R]=1;
R++;
swap(S[k],S[1]);
	ok=true;
	for(j=0;j<N;j++){
	if(S[j]!=j)ok=false;
	}
	if(ok){
	return R;
	}
swap(S[0],S[1]);
	}
}

for(i=2;i<N;i++){//find i, send it to ith position

for(k=0;k<N;k++){
if(S[k]==i)break;
}
if(k!=i){
P[R]=k;
Q[R]=i;
R++;
swap(S[k],S[i]);
	ok=true;
	for(j=0;j<N;j++){
	if(S[j]!=j)ok=false;
	}
	if(ok){
	return R;
	}
}

}

if(f&&R%2==1){
P[R]=0;
Q[R]=0;
R++;
}else if(f==false && R%2==0 ){
P[R]=0;
Q[R]=0;
R++;
}

}else{//his moves are redundant


for(i=0;i<N;i++){//find i, send it to ith position

for(k=0;k<N;k++){
if(S[k]==i)break;
}
if(k!=i){
P[R]=k;
Q[R]=i;
R++;
swap(S[k],S[i]);
	ok=true;
	for(j=0;j<N;j++){
	if(S[j]!=j)ok=false;
	}
	if(ok){
	return R;
	}
}

}
/*
for(i=0;i<N;i++){
cout<<S[i]<<" ";
}cout<<endl;*/
//while(R>0&&P[R-1]==Q[R-1])R--;


}


	return R;
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:15:39: warning: unused parameter 'M' [-Wunused-parameter]
   15 | int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
      |                                   ~~~~^
sorting.cpp:15:46: warning: unused parameter 'X' [-Wunused-parameter]
   15 | 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