Language: C++

#include <iostream>
#include <ios>
#include <iomanip>
#include <algorithm>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <utility>
#include <typeinfo>
#include <tuple>
using namespace std;

#define MOD 1000000007
#define INF 1e9+7
#define INF_LONG 1e18
#define rep(i, n) for(int i=0; i<n; ++i)
#define rep1(i, n) for(int i=1; i<=n; ++i)
#define rrep(i, m, n) for(int i=m; i<n; ++i)
#define countof(array) (sizeof(array) / sizeof(array[0]))
typedef long long ll;

#define MAX_N 200000
#define MAX_M 100000
#define MAX_V 100
#define MAX_E 100
#define MAX_Q 100000

int dx[] = {-1, 0, 1, 0};
int dy[] = {0, -1, 0, 1};

int ddx[] = {-1, 0, 1, 0, -1, 1, -1, 1};
int ddy[] = {0, -1, 0, 1, 1, 1, -1, -1};

string ab = {"ABCDEFGHIJKLMNOPQRSTUVWXYZ"};
string as = {"abcdefghijklmnopqrstuvwxyz"};

ll gcd(ll x, ll y) {
  if(y==0) return x;
  else return gcd(y, x%y);
}

ll lcm(ll x, ll y) {
  return (x*y)/gcd(x, y);
}

void yes() {
  cout << "Yes" << endl;
}

void no() {
  cout << "No" << endl;
}

void print_array(int array[], int len) {

  for(int i=0; i<len; ++i) {
    cout << array[i] << endl;
  }

}

ll absolute(ll x) {
  return (x<0)? (-1)*x : x;
}

//g++ AtCoder.cpp -o AtCoder
//AtCoder

//--------------------------
int main() {

  string s, t, u;
  cin >> s >> t;
  int a, b;
  cin >> a >> b >> u;

  if(s==u) cout << s-1 << " " << t << endl;
  else if(t==u) cout << s << " " << t-1 << endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:85:21: error: no match for 'operator-' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'int')
   85 |   if(s==u) cout << s-1 << " " << t << endl;
      |                    ~^~
      |                    | |
      |                    | int
      |                    std::string {aka std::__cxx11::basic_string<char>}
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:618:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__y.base() - __x.base())) std::operator-(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  618 |     operator-(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:618:5: note:   template argument deduction/substitution failed:
a.cc:85:22: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   85 |   if(s==u) cout << s-1 << " " << t << endl;
      |                      ^
/usr/include/c++/14/bits/stl_iterator.h:1790:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__x.base() - __y.base())) std::operator-(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1790 |     operator-(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1790:5: note:   template argument deduction/substitution failed:
a.cc:85:22: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   85 |   if(s==u) cout << s-1 << " " << t << endl;
      |                      ^
a.cc:86:38: error: no match for 'operator-' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'int')
   86 |   else if(t==u) cout << s << " " << t-1 << endl;
      |                                     ~^~
      |                                     | |
      |                                     | int
      |                                     std::string {aka std::__cxx11::basic_string<char>}
/usr/include/c++/14/bits/stl_iterator.h:618:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__y.base() - __x.base())) std::operator-(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  618 |     operator-(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:618:5: note:   template argument deduction/substitution failed:
a.cc:86:39: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   86 |   else if(t==u) cout << s << " " << t-1 << endl;
      |                                       ^
/usr/include/c++/14/bits/stl_iterator.h:1790:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__x.base() - __y.base())) std::operator-(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1790 |     operator-(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1790:5: note:   template argument deduction/substitution failed:
a.cc:86:39: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   86 |   else if(t==u) cout << s << " " << t-1 << endl;
      |                                       ^