Language: C++

#include <iostream>
#include <string>
#include <map>
#include <algorithm>
using namespace std;

int main(){
	string T, P;
	cin >> T >> P;
	map<char, long> skip;
	for (long i = P.size() - 1; i >= 0; i--){
		map<char, long>::iterator itr = skip.find(P[i]);
		if (itr == skip.end()) skip[P[i]] = (P.size() - 1) - i;
	}

	/*
	for (map<char, long>::iterator itr = skip.begin(); itr != skip.end(); itr++){
		cout << "key = " << itr->first << ", val = " << itr->second << endl;
	}
	*/
	
	long f = P.size() - 1;
	while (f < T.size()){
		if (T[f] == P[P.size() - 1]){
			for (long i = 0; i < P.size(); i++){
				if (T[f - i] != P[P.size() - i - 1]){
					f += max(skip[T[f - i]], 1);
					break;
				}
				if (i == P.size() - 1){
					cout << f - P.size() + 1 << endl;
					f++;
				}
			}
		}
		else {
			map<char, long>::iterator itr = skip.find(T[f]);
			if (itr == skip.end()) f += P.size();
			else f += skip[T[f]];
		}
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:49: error: no matching function for call to 'max(std::map<char, long int>::mapped_type&, int)'
   27 |                                         f += max(skip[T[f - i]], 1);
      |                                              ~~~^~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 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_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:27:49: note:   deduced conflicting types for parameter 'const _Tp' ('long int' and 'int')
   27 |                                         f += max(skip[T[f - 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,
                 from a.cc:4:
/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:27:49: note:   mismatched types 'std::initializer_list<_Tp>' and 'long int'
   27 |                                         f += max(skip[T[f - i]], 1);
      |                                              ~~~^~~~~~~~~~~~~~~~~~~