Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#include <map>
#include <utility>
#include <tuple>
#include <string>
#include <cctype>
#include <cstdio>
#include <math.h>
using i8 = int8_t;
using u8 = uint8_t;
using i16 = int16_t;
using u16 = uint16_t;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
using f32 = float;
using f64 = double;
using f80 = __float80;
constexpr i64 INF = 1'010'000'000'000'000'017LL;
constexpr i64 MOD = 1'000'000'007LL;
constexpr f64 EPS = 1e-12;
constexpr f64 PI = 3.14159265358979323846;
const int AMAX = 100000; 
using namespace std;
#define rep(i, n) for (i64 i = 0; i < (int)(n); i++)
#define FOR(i, m, n) for (i64 i = m; i < n; i++)
#define SORT(x) sort(x.begin(), x.end())
#define REVE(x) reverse(x.begin(), x.end())
#define all(x) (x).begin(), (x).end()
#define fst first
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pob pop_back
#define sw swap
#define UP(x) transform(x.begin(), x.end(), x.begin(), ::toupper);
#define down(x) transform(x.begin(), x.end(), x.begin(), ::tolower);
using LL = long long;
using ULL = unsigned long long;
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;
}

int main(void) {
     vector<LL> cnt[AMAX + 1];
 int N;
 LL K;
 cin >> N >> K;

 for (int i = 0; i < N; ++i) {
 int A, B;
 cin >> A >> B;
cnt[A] += B;
}

SORT(cnt);
for (int ans = 1; ans <= AMAX; ++ans){
 if (K <= cnt[ans]) {
cout << ans << endl;
return 0;
  }
 }
}

Compiler output:
a.cc:13:12: error: 'uint8_t' does not name a type
   13 | using u8 = uint8_t;
      |            ^~~~~~~
a.cc:12:1: note: 'uint8_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
   11 | #include <math.h>
  +++ |+#include <cstdint>
   12 | using i8 = int8_t;
a.cc:15:13: error: 'uint16_t' does not name a type
   15 | using u16 = uint16_t;
      |             ^~~~~~~~
a.cc:15:13: note: 'uint16_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
a.cc:17:13: error: 'uint32_t' does not name a type
   17 | using u32 = uint32_t;
      |             ^~~~~~~~
a.cc:17:13: note: 'uint32_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
a.cc:19:13: error: 'uint64_t' does not name a type
   19 | using u64 = uint64_t;
      |             ^~~~~~~~
a.cc:19:13: note: 'uint64_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
a.cc: In function 'int main()':
a.cc:74:8: error: no match for 'operator+=' (operand types are 'std::vector<long long int>' and 'int')
   74 | cnt[A] += B;
      | ~~~~~~~^~~~
a.cc:31:24: error: request for member 'begin' in 'cnt', which is of non-class type 'std::vector<long long int> [100001]'
   31 | #define SORT(x) sort(x.begin(), x.end())
      |                        ^~~~~
a.cc:77:1: note: in expansion of macro 'SORT'
   77 | SORT(cnt);
      | ^~~~
a.cc:31:35: error: request for member 'end' in 'cnt', which is of non-class type 'std::vector<long long int> [100001]'
   31 | #define SORT(x) sort(x.begin(), x.end())
      |                                   ^~~
a.cc:77:1: note: in expansion of macro 'SORT'
   77 | SORT(cnt);
      | ^~~~
a.cc:79:8: error: no match for 'operator<=' (operand types are 'LL' {aka 'long long int'} and 'std::vector<long long int>')
   79 |  if (K <= cnt[ans]) {
      |      ~ ^~ ~~~~~~~~
      |      |           |
      |      |           std::vector<long long int>
      |      LL {aka long long int}
In file included from /usr/include/c++/14/string:48,
                 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_iterator.h:469:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<=(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  469 |     operator<=(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:469:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'LL' {aka 'long long int'}
   79 |  if (K <= cnt[ans]) {
      |                  ^
/usr/include/c++/14/bits/stl_iterator.h:513:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<=(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  513 |     operator<=(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:513:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'LL' {aka 'long long int'}
   79 |  if (K <= cnt[ans]) {
      |                  ^
/usr/include/c++/14/bits/stl_iterator.h:1704:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1704 |     operator<=(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1704:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'LL' {aka 'long long int'}
   79 |  if (K <= cnt[ans]) {
      |                  ^
/usr/include/c++/14/bits/stl_iterator.h:1767:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1767 |     operator<=(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1767:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'LL' {aka 'long long int'}
   79 |  if (K <= cnt[ans]) {
      |                  ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1064:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<=(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1064 |     operator<=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1064:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'const std::pair<_T1, _T2>' and 'LL' {aka 'long long int'}
   79 |  if (K <= cnt[ans]) {
      |                  ^
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:717:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<=(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  717 |     operator<=(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:717:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'long long int'
   79 |  if (K <= cnt[ans]) {
      |                  ^
/usr/include/c++/14/string_view:724:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<=(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  724 |     operator<=(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:724:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'long long int'
   79 |  if (K <= cnt[ans]) {
      |                  ^
/usr/include/c++/14/string_view:732:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<=(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  732 |     operator<=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:732:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   'std::vector<long long int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   79 |  if (K <= cnt[ans]) {
      |                  ^
/usr/include/c++/14/bits/basic_string.h:3956:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<=(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3956 |     operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3956:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'LL' {aka 'long long int'}
   79 |  if (K <= cnt[ans]) {
      |                  ^
/usr/include/c++/14/bits/basic_string.h:3970:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<=(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3970 |     operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3970:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'LL' {aka 'long long int'}
   79 |  if (K <= cnt[ans]) {
      |                  ^
/usr/include/c++/14/bits/basic_string.h:3983:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<=(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3983 |     operator<=(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3983:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'const _CharT*' and 'long long int'
   79 |  if (K <= cnt[ans]) {
      |                  ^
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/tuple:2625:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator<=(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2625 |     operator<=(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2625:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'const std::tuple<_UTypes ...>' and 'LL' {aka 'long long int'}
   79 |  if (K <= cnt[ans]) {
      |                  ^
In file included from /usr/include/c++/14/vector:66,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_vector.h:2108:5: note: candidate: 'template<class _Tp, class _Alloc> bool std::operator<=(const vector<_Tp, _Alloc>&, const vector<_Tp, _Alloc>&)'
 2108 |     operator<=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:2108:5: note:   template argument deduction/substitution failed:
a.cc:79:18: note:   mismatched types 'const std::vector<_Tp, _Alloc>' and 'LL' {aka 'long long int'}
   79 |  if (K <= cnt[ans]) {
      |                  ^
In file included from /usr/include/c++/14/set:63,
                 from a.cc:4:
/usr/include/c++/14/bits/stl_set.h:1046:5: note: candidat