Submission #259706

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
259706	2020-08-08 11:23:10	youssefbou62	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	37 ms	5112 KiB

shoes

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#include <bits/stdc++.h>
#include "shoes.h"
#define ll long long 
#define pb push_back
#define sz(x) (int)x.size()
#define all(x) x.begin(),x.end()
using namespace std; 
const int MAXN = 2005 ; 
vector<int> posR[MAXN],posL[MAXN] ; 
long long count_swaps(std::vector<int> s) {
  ll ans = 0; 
  int n = sz(s)/2 ; 
  for(int i=0;i<sz(s);i++ ){
    int a = s[i] ; 
    if( a > 0 )posR[a].pb(i);
    else posL[-a].pb(i) ;
  }
  for(int i = 1 ; i <= n ; i++ ){
    reverse(all(posR[i]));
    reverse(all(posL[i])); 
  }
  for(int i = 0 ; i < n ; i++ ){
    int l = i * 2 , r = i*2 + 1 ; 
    int bestL , bestR , toadd = 1e9 , bestS = -1; 
    for(int j = 1 ; j <= n ; j++ ){
      while ( !posL[j].empty() && l > posL[j].back() )posL[j].pop_back(); 
      if( posL[j].empty() )continue ; 
      int currL = posL[j].back();
 
 
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Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:47:5: warning: 'bestR' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if( bestR > x )x++ ; 
     ^~
shoes.cpp:46:5: warning: 'bestL' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if( bestL > x )x++; 
     ^~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 20 / 20
• Subtask 6: 0 / 15