Language: C++

#pragma GCC optimize ("Ofast")
#pragma GCC target ("sse4")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll, ll> pll;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define all(x) begin(x),end(x)

#define forn(i, n) for (int i = 0; i < n; ++i)
#define rforn(i, n) for (int i = n - 1; i >= 0; --i)

const int N = 2e5 + 5, M = 1e9 + 7; // 998244353
const int dx[]{0, 1, 0, -1}, dy[]{1, 0, -1, 0};
const ll INF = 1e18 + 10LL;
const ld PI = 4.0 * atan((ld) 1.0), EPS = 1e-6;
const char nl = '\n';

template <typename T> inline T gcd(T a, T b) { return b == 0 ? a : gcd(b, a % b); }
template <typename T> inline T lcm(T a, T b) { return a / gcd(a, b) * b; }
template <class T> void ckmin(T& a, T b) { a = min(a, b); }
template <class T> void ckmax(T& a, T b) { a = max(a, b); }
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

string YN(bool x) { return x ? "YES" : "NO"; }

void solve(int tcn) {
	int n, q;
	cin >> n;
	map<int, int> m;
	ll sum = 0LL;
	forn(i, n) {
		int cur;
		cin >> cur;
		++m[cur];
		sum += cur;
	}
	cin >> q;
	while (q--) {
		int b, c;
		cin >> b >> c;
		lldiv_t x = m[b];
		sum -= x * b;
		sum += x * c;
		m[b] = 0;
		m[c] += x;
		cout << sum << nl;
	}
}

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);

	int t = 1; //cin >> t;
	for (int i = 1; i <= t; ++i) {
		solve(i);
	}
	return 0;
}


Compiler output:
a.cc: In function 'void solve(int)':
a.cc:56:32: error: conversion from 'std::map<int, int>::mapped_type' {aka 'int'} to non-scalar type 'lldiv_t' requested
   56 |                 lldiv_t x = m[b];
      |                                ^
a.cc:57:26: error: no match for 'operator*' (operand types are 'lldiv_t' and 'int')
   57 |                 sum -= x * b;
      |                        ~ ^ ~
      |                        |   |
      |                        |   int
      |                        lldiv_t
In file included from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:4:
/usr/include/c++/14/complex:400:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const complex<_Tp>&)'
  400 |     operator*(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:400:5: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   'lldiv_t' is not derived from 'const std::complex<_Tp>'
   57 |                 sum -= x * b;
      |                            ^
/usr/include/c++/14/complex:409:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const _Tp&)'
  409 |     operator*(const complex<_Tp>& __x, const _Tp& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:409:5: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   'lldiv_t' is not derived from 'const std::complex<_Tp>'
   57 |                 sum -= x * b;
      |                            ^
/usr/include/c++/14/complex:418:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const _Tp&, const complex<_Tp>&)'
  418 |     operator*(const _Tp& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:418:5: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   mismatched types 'const std::complex<_Tp>' and 'int'
   57 |                 sum -= x * b;
      |                            ^
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:407:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   'lldiv_t' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   57 |                 sum -= x * b;
      |                            ^
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   'lldiv_t' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   57 |                 sum -= x * b;
      |                            ^
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   57 |                 sum -= x * b;
      |                            ^
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   'lldiv_t' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   57 |                 sum -= x * b;
      |                            ^
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   57 |                 sum -= x * b;
      |                            ^
/usr/include/c++/14/valarray:1198:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__multiplies, _Tp>::result_type> std::operator*(const valarray<_Tp>&, const valarray<_Tp>&)'
 1198 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1198:1: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   'lldiv_t' is not derived from 'const std::valarray<_Tp>'
   57 |                 sum -= x * b;
      |                            ^
/usr/include/c++/14/valarray:1198:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__multiplies, _Tp>::result_type> std::operator*(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1198 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1198:1: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   'lldiv_t' is not derived from 'const std::valarray<_Tp>'
   57 |                 sum -= x * b;
      |                            ^
/usr/include/c++/14/valarray:1198:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__multiplies, _Tp>::result_type> std::operator*(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1198 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1198:1: note:   template argument deduction/substitution failed:
a.cc:57:28: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
   57 |                 sum -= x * b;
      |                            ^
a.cc:58:26: error: no match for 'operator*' (operand types are 'lldiv_t' and 'int')
   58 |                 sum += x * c;
      |                        ~ ^ ~
      |                        |   |
      |                        |   int
      |                        lldiv_t
/usr/include/c++/14/complex:400:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const complex<_Tp>&)'
  400 |     operator*(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:400:5: note:   template argument deduction/substitution failed:
a.cc:58:28: note:   'lldiv_t' is not derived from 'const std::complex<_Tp>'
   58 |                 sum += x * c;
      |                            ^
/usr/include/c++/14/complex:409:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const _Tp&)'
  409 |     operator*(const complex<_Tp>& __x, const _Tp& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:409:5: note:   template argument deduction/substitution failed:
a.cc:58:28: note:   'lldiv_t' is not derived from 'const std::complex<_Tp>'
   58 |                 sum += x * c;
      |                            ^
/usr/include/c++/14/complex:418:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const _Tp&, const complex<_Tp>&)'
  418 |     operator*(const _Tp& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:418:5: note:   template argument deduction/substitution failed:
a.cc:58:28: note:   mismatched types 'const std::complex<_Tp>' and 'int'
   58 |                 sum += x * c;
      |                            ^
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/