Language: C++

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

int main() {
  long long n,ans;
  ans=0;
  cin>>n;
  vector<pair<long long, long long>>a(n);
  for(int i=0;i<n;i++){
    cin>>a[i].first;
    a[i].second=i+1;
  }
  sort(a.begin(),a.end());
  vector<bool>b(n);
  for(int i=0;<n;i++) b[i]=true;
  for(int i=n-1;i<=0;i--){
    long long l,r;
    for(int i=0;i<n;i++){
      if(b[i]){
        left=i+1;
        break;
      }
    }
    for(int i=0;i<n;i++){
      if(b[n-1-i]){
        right=n-i;
        break;
      }
    }
    if(abs(left-a[i].second)>abs(right-a[i].second)){
      ans+=(left-a[i].second)*a[i].first;
      b[left-1]=false;
    }
    else if(abs(left-a[i].second)<abs(right-a[i].second)){
      ans+=(right-a[i].second)*a[i].first;
      b[right-1]=false;
    }
    else{
      if(abs(left-a[i+1].second)>abs(right-a[i-1].second)){
        ans+=(right-a[i].second)*a[i].first;
        b[right-1]=false;
      }
      else{
        ans+=(left-a[i].second)*a[i].first;
        b[left-1]=false;
      }
    }
  }
  cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:15: error: expected primary-expression before '<' token
   15 |   for(int i=0;<n;i++) b[i]=true;
      |               ^
a.cc:20:13: error: assignment of function 'std::ios_base& std::left(ios_base&)'
   20 |         left=i+1;
      |         ~~~~^~~~
a.cc:26:14: error: assignment of function 'std::ios_base& std::right(ios_base&)'
   26 |         right=n-i;
      |         ~~~~~^~~~
a.cc:30:16: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |            ~~~~^~~~~~~~~~~~
a.cc:30:11: error: no matching function for call to 'abs(std::ios_base& (*)(std::ios_base&))'
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |        ~~~^~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/cstdlib:79,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:42,
                 from a.cc:1:
/usr/include/stdlib.h:980:12: note: candidate: 'int abs(int)' (near match)
  980 | extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
      |            ^~~
/usr/include/stdlib.h:980:12: note:   conversion of argument 1 would be ill-formed:
a.cc:30:16: error: invalid conversion from 'std::ios_base& (*)(std::ios_base&)' to 'int' [-fpermissive]
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |            ~~~~^~~~~~~~~~~~
      |                |
      |                std::ios_base& (*)(std::ios_base&)
In file included from /usr/include/c++/14/cstdlib:81:
/usr/include/c++/14/bits/std_abs.h:85:3: note: candidate: 'constexpr __int128 std::abs(__int128)' (near match)
   85 |   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:85:3: note:   conversion of argument 1 would be ill-formed:
a.cc:30:16: error: invalid conversion from 'std::ios_base& (*)(std::ios_base&)' to '__int128' [-fpermissive]
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |            ~~~~^~~~~~~~~~~~
      |                |
      |                std::ios_base& (*)(std::ios_base&)
/usr/include/c++/14/bits/std_abs.h:61:3: note: candidate: 'long long int std::abs(long long int)' (near match)
   61 |   abs(long long __x) { return __builtin_llabs (__x); }
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:61:3: note:   conversion of argument 1 would be ill-formed:
a.cc:30:16: error: invalid conversion from 'std::ios_base& (*)(std::ios_base&)' to 'long long int' [-fpermissive]
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |            ~~~~^~~~~~~~~~~~
      |                |
      |                std::ios_base& (*)(std::ios_base&)
/usr/include/c++/14/bits/std_abs.h:56:3: note: candidate: 'long int std::abs(long int)' (near match)
   56 |   abs(long __i) { return __builtin_labs(__i); }
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:56:3: note:   conversion of argument 1 would be ill-formed:
a.cc:30:16: error: invalid conversion from 'std::ios_base& (*)(std::ios_base&)' to 'long int' [-fpermissive]
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |            ~~~~^~~~~~~~~~~~
      |                |
      |                std::ios_base& (*)(std::ios_base&)
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/bits/valarray_after.h:445:5: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_UnClos<std::_Abs, std::_ValArray, _Tp>, _Tp> std::abs(const valarray<_Tp>&)'
  445 |     _DEFINE_EXPR_UNARY_FUNCTION(abs, struct std::_Abs)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:445:5: note:   template argument deduction/substitution failed:
a.cc:30:11: note:   mismatched types 'const std::valarray<_Tp>' and 'std::ios_base& (*)(std::ios_base&)'
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |        ~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:445:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_UnClos<std::_Abs, std::_Expr, _Dom>, typename _Dom::value_type> std::abs(const _Expr<_Dom1, typename _Dom1::value_type>&)'
  445 |     _DEFINE_EXPR_UNARY_FUNCTION(abs, struct std::_Abs)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:445:5: note:   template argument deduction/substitution failed:
a.cc:30:11: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'std::ios_base& (*)(std::ios_base&)'
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |        ~~~^~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/complex:892:5: note: candidate: 'template<class _Tp> _Tp std::abs(const complex<_Tp>&)'
  892 |     abs(const complex<_Tp>& __z) { return __complex_abs(__z.__rep()); }
      |     ^~~
/usr/include/c++/14/complex:892:5: note:   template argument deduction/substitution failed:
a.cc:30:11: note:   mismatched types 'const std::complex<_Tp>' and 'std::ios_base& (*)(std::ios_base&)'
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |        ~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/std_abs.h:137:3: note: candidate: 'constexpr __float128 std::abs(__float128)'
  137 |   abs(__float128 __x)
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:137:18: note:   no known conversion for argument 1 from 'std::ios_base& (*)(std::ios_base&)' to '__float128'
  137 |   abs(__float128 __x)
      |       ~~~~~~~~~~~^~~
/usr/include/c++/14/bits/std_abs.h:79:3: note: candidate: 'constexpr long double std::abs(long double)'
   79 |   abs(long double __x)
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:79:19: note:   no known conversion for argument 1 from 'std::ios_base& (*)(std::ios_base&)' to 'long double'
   79 |   abs(long double __x)
      |       ~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/std_abs.h:75:3: note: candidate: 'constexpr float std::abs(float)'
   75 |   abs(float __x)
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:75:13: note:   no known conversion for argument 1 from 'std::ios_base& (*)(std::ios_base&)' to 'float'
   75 |   abs(float __x)
      |       ~~~~~~^~~
/usr/include/c++/14/bits/std_abs.h:71:3: note: candidate: 'constexpr double std::abs(double)'
   71 |   abs(double __x)
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:71:14: note:   no known conversion for argument 1 from 'std::ios_base& (*)(std::ios_base&)' to 'double'
   71 |   abs(double __x)
      |       ~~~~~~~^~~
a.cc:30:39: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |                                  ~~~~~^~~~~~~~~~~~
a.cc:30:33: error: no matching function for call to 'abs(std::ios_base& (*)(std::ios_base&))'
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |                              ~~~^~~~~~~~~~~~~~~~~~~
/usr/include/stdlib.h:980:12: note: candidate: 'int abs(int)' (near match)
  980 | extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
      |            ^~~
/usr/include/stdlib.h:980:12: note:   conversion of argument 1 would be ill-formed:
a.cc:30:39: error: invalid conversion from 'std::ios_base& (*)(std::ios_base&)' to 'int' [-fpermissive]
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |                                  ~~~~~^~~~~~~~~~~~
      |                                       |
      |                                       std::ios_base& (*)(std::ios_base&)
/usr/include/c++/14/bits/std_abs.h:85:3: note: candidate: 'constexpr __int128 std::abs(__int128)' (near match)
   85 |   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:85:3: note:   conversion of argument 1 would be ill-formed:
a.cc:30:39: error: invalid conversion from 'std::ios_base& (*)(std::ios_base&)' to '__int128' [-fpermissive]
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |                                  ~~~~~^~~~~~~~~~~~
      |                                       |
      |                                       std::ios_base& (*)(std::ios_base&)
/usr/include/c++/14/bits/std_abs.h:61:3: note: candidate: 'long long int std::abs(long long int)' (near match)
   61 |   abs(long long __x) { return __builtin_llabs (__x); }
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:61:3: note:   conversion of argument 1 would be ill-formed:
a.cc:30:39: error: invalid conversion from 'std::ios_base& (*)(std::ios_base&)' to 'long long int' [-fpermissive]
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |                                  ~~~~~^~~~~~~~~~~~
      |                                       |
      |                                       std::ios_base& (*)(std::ios_base&)
/usr/include/c++/14/bits/std_abs.h:56:3: note: candidate: 'long int std::abs(long int)' (near match)
   56 |   abs(long __i) { return __builtin_labs(__i); }
      |   ^~~
/usr/include/c++/14/bits/std_abs.h:56:3: note:   conversion of argument 1 would be ill-formed:
a.cc:30:39: error: invalid conversion from 'std::ios_base& (*)(std::ios_base&)' to 'long int' [-fpermissive]
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |                                  ~~~~~^~~~~~~~~~~~
      |                                       |
      |                                       std::ios_base& (*)(std::ios_base&)
/usr/include/c++/14/bits/valarray_after.h:445:5: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_UnClos<std::_Abs, std::_ValArray, _Tp>, _Tp> std::abs(const valarray<_Tp>&)'
  445 |     _DEFINE_EXPR_UNARY_FUNCTION(abs, struct std::_Abs)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:445:5: note:   template argument deduction/substitution failed:
a.cc:30:33: note:   mismatched types 'const std::valarray<_Tp>' and 'std::ios_base& (*)(std::ios_base&)'
   30 |     if(abs(left-a[i].second)>abs(right-a[i].second)){
      |                              ~~~^~~~~~~~~