Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,m,a,b,x=0,y=0;
    cin>>n>>m;
    vector<int>vecx;
    vector<int>vecy;
    for(int i=0;i<m;i++){
        cin>>a>>b;
        if(a==1)vecx.push_back(b);
        if(b==n)vecy.push_back(a);
    }
    sort(vecx.begin(),vecx.end());
    sort(vecy.begin(),vecy.end());
    while(max(x<=vecx.size(),0)&&y<=max(0,vecy.size())){
        if(vecx[x]==vecy[y]){
            cout<<"POSSIBLE"<<endl;
            return 0;
        }
        if(vecx[x]<vecy[y])x++;
        else y++;
    }
    cout<<"IMPOSSIBLE"<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:14: error: no matching function for call to 'max(bool, int)'
   15 |     while(max(x<=vecx.size(),0)&&y<=max(0,vecy.size())){
      |           ~~~^~~~~~~~~~~~~~~~~~
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:15:14: note:   deduced conflicting types for parameter 'const _Tp' ('bool' and 'int')
   15 |     while(max(x<=vecx.size(),0)&&y<=max(0,vecy.size())){
      |           ~~~^~~~~~~~~~~~~~~~~~
/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:15:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'bool'
   15 |     while(max(x<=vecx.size(),0)&&y<=max(0,vecy.size())){
      |           ~~~^~~~~~~~~~~~~~~~~~
a.cc:15:40: error: no matching function for call to 'max(int, std::vector<int>::size_type)'
   15 |     while(max(x<=vecx.size(),0)&&y<=max(0,vecy.size())){
      |                                     ~~~^~~~~~~~~~~~~~~
/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:15:40: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::vector<int>::size_type' {aka 'long unsigned int'})
   15 |     while(max(x<=vecx.size(),0)&&y<=max(0,vecy.size())){
      |                                     ~~~^~~~~~~~~~~~~~~
/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
/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:15:40: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   15 |     while(max(x<=vecx.size(),0)&&y<=max(0,vecy.size())){
      |                                     ~~~^~~~~~~~~~~~~~~