Submission #959438

#	Time	Username	Problem	Language	Result	Execution time	Memory
959438		NemanjaSo2005	Arranging Shoes (IOI19_shoes)	C++17	Compilation error	0 ms	0 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int maxn=2e5+5;
int N,niz[maxn];
ll res=0;
int prvalev(){
   for(int i=1;i<=N;i++)
      if(niz[i]<0)
         return i;
}
int parod(int x){
   for(int i=1;i<=N;i++)
      if(niz[i]==-x)
         return i;
}
void zamena(int y,int x){
   for(int i=y;i>x;i--){
      res++;
      swap(niz[i],niz[i-1]);
   }
}
ll count_swaps(vector<int> s) {
	N=s.size();
	return (N/2-1)*(N/2);
	for(int i=0;i<N;i++)
      niz[i+1]=s[i];
   for(int i=1;i<=N;i+=2){
      int pl=prvalev();
      zamena(pl,i);
      int pd=parod(niz[i]);
     // cout<<pl<<" "<<pd<<endl;
      zamena(pd,i+1);
      niz[i]=niz[i+1]=0;
   }
   return res;
}


#include <cstdio>
#include <cassert>
using namespace std;
int main() {
	int n;
	assert(1 == scanf("%d", &n));
	vector<int> S(2 * n);
	for (int i = 0; i < 2 * n; i++)
		assert(1 == scanf("%d", &S[i]));
	fclose(stdin);

	long long result = count_swaps(S);

	printf("%lld\n", result);
	fclose(stdout);
	return 0;
}

Compilation message (stderr)

shoes.cpp: In function 'int prvalev()':
shoes.cpp:12:1: warning: control reaches end of non-void function [-Wreturn-type]
   12 | }
      | ^
shoes.cpp: In function 'int parod(int)':
shoes.cpp:17:1: warning: control reaches end of non-void function [-Wreturn-type]
   17 | }
      | ^
/usr/bin/ld: /tmp/cc1Da9DX.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccp6ZzQU.o:shoes.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status