Language: C++

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

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	string s;
	cin >> s;
	long long n = s.size();
	long long cnt[26] = {};
	for(char c : s) {
		cnt[c-'a'] ++;
	}
	long long odd = 0;
	long long sp = -1;
	for(long long i = 0; i < 26; ++i) {
		odd += cnt[i]%2;
		if(cnt[i]&1) sp = i;
		cnt[i] >>= 1;
	}
	if(odd > 1) return cout << -1 << endl, 0;

	vector<long long> t(n);
	vector<long long> ord[3];
	for(long long i = 0; i < n; ++i) {
		long long p = s[i] -'a';
		if(p == sp) {
			if(cnt[p] > 0) {
				t[i] = 0;
				--cnt[p];
				ord[0].push_back(i);
			}
			else if(cnt[p] == 0) {
				t[i] = 1;
				--cnt[p];
				ord[1].push_back(i);

			}
			else if(cnt[p] < 0) {
				t[i] = 2;
				ord[2].push_back(i);
			}
		}
		else {
			if(cnt[p]) {
				t[i] = 0;
				--cnt[p];
				ord[0].push_back(i);
			}
			else {
				t[i] = 2;
				ord[2].push_back(i);
			}

		}
	}

	long long pref[3][n];
	for(long long i = 0; i < n; ++i) {
		for(long long j = 0; j < 3; ++j) {
			pref[j][i] = (i ? pref[j][i-1] : 0);
		}
		pref[t[i]][i]++;
	}
	long long inv = 0;
	for(long long i = 0; i < n; ++i) {
		for(long long j = 2; j > t[i]; --j) {
			inv += pref[j][i];
		}
	}

	queue<long long> q[26];
	for(long long i = 1; i <= ord[2].size(); ++i) {
		q[s[ord[2][ord[2].size() - i]] - 'a'].push(i);
	}
	for(long long i = 0; i < ord[0].size(); ++i) {
		long long p = q[s[ord[0][i]] - 'a'].front();
		q[s[ord[0][i]] - 'a'].pop();
		inv += max(0, p - (i + 1));
	}
	cout << inv << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:79:27: error: no matching function for call to 'max(int, long long int)'
   79 |                 inv += max(0, p - (i + 1));
      |                        ~~~^~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:79:27: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   79 |                 inv += max(0, p - (i + 1));
      |                        ~~~^~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:79:27: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   79 |                 inv += max(0, p - (i + 1));
      |                        ~~~^~~~~~~~~~~~~~~~