Language: C++

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<string>
#include<vector>
#include<list>
#include<set>
#include<map>
#include<queue>
#include<stack>
#include<cctype>
#include<climits>
#include<bitset>
#include<bits/stdc++.h>
#define ld long double
#define ll long long int
#define ull unsigned long long int
#define rep(i,n) for(i=0;i<n;i++)
#define fin(ans) cout<<(ans)<<endl
#define INF INT_MAX
#define vvi vector<vector<int> >
#define vvc vector<vector<char> >
#define vvs vector<vector<string> >
using namespace std;
template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
const long long LLINF=1LL<<60;
//set<int>::iterator it;




int main(void){ios::sync_with_stdio(false);cin.tie(0);
//////////////////////////////////////////////////////
	
	int i,n;
	ll m=LLINF;
	ll sum=0;
	cin>>n;
	vector<int> v(n,0);
	int minus=0;
	rep(i,n){
		cin>>v[i];
		if(v[i]<0)minus++;
		m=min(m,abs(v[i]));
		sum+=abs(v[i]);
	}
	if(m%2==0){
		cout<<sum<<endl;
	}
	else cout<<sum-2*m<<endl;
	
	
//	cout<<sum<<" "<<m<<endl;
	
	
//////////////////////////////////////////////////////
	return 0;
}








Compiler output:
a.cc: In function 'int main()':
a.cc:46:22: error: no matching function for call to 'min(long long int&, int)'
   46 |                 m=min(m,abs(v[i]));
      |                   ~~~^~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:46:22: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   46 |                 m=min(m,abs(v[i]));
      |                   ~~~^~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:3:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:46:22: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   46 |                 m=min(m,abs(v[i]));
      |                   ~~~^~~~~~~~~~~~~