Compilare: main.cpp: In function 'int main()': main.cpp:50:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(int i = 0; i < s.size(); i++){ | ~~^~~~~~~~~~ main.cpp:65:71: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | if(mat[l][c][0] == 0 && mat[l][c][dcur] == 0 && i == (s.size() - 1)){ | ~~^~~~~~~~~~~~~~~~~ main.cpp:48:9: warning: unused variable 'd' [-Wunused-variable] 48 | int d, dcur, ok; | ^ main.cpp: In function 'int dir(char)': main.cpp:14:1: warning: control reaches end of non-void function [-Wreturn-type] 14 | } | ^ In file included from /usr/include/c++/12.2.1/functional:54, from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/stdc++.h:71, from main.cpp:1: In constructor 'constexpr std::_Head_base<_Idx, _Head, false>::_Head_base(_UHead&&) [with _UHead = int&; long unsigned int _Idx = 1; _Head = int]', inlined from 'constexpr std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(_UHead&&, _UTail&& ...) [with _UHead = int&; _UTail = {int}; <template-parameter-2-3> = void; long unsigned int _Idx = 1; _Head = int; _Tail = {int}]' at /usr/include/c++/12.2.1/tuple:292:38, inlined from 'constexpr std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(_UHead&&, _UTail&& ...) [with _UHead = int&; _UTail = {int&, int}; <template-parameter-2-3> = void; long unsigned int _Idx = 0; _Head = int; _Tail = {int, int}]' at /usr/include/c++/12.2.1/tuple:292:38, inlined from 'constexpr std::tuple< <template-parameter-1-1> >::tuple(_UElements&& ...) [with _UElements = {int&, int&, int}; bool _Valid = true; typename std::enable_if<_TCC<_Valid>::__is_implicitly_constructible<_UElements ...>(), bool>::type <anonymous> = true; _Elements = {int, int, int}]' at /usr/include/c++/12.2.1/tuple:744:54, inlined from 'int main()' at main.cpp:47:11: /usr/include/c++/12.2.1/tuple:200:11: warning: 'y' may be used uninitialized [-Wmaybe-uninitialized] 200 | : _M_head_impl(std::forward<_UHead>(__h)) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:23:18: note: 'y' was declared here 23 | int n, m, x, y, p, cnt = 0; | ^ In constructor 'constexpr std::_Head_base<_Idx, _Head, false>::_Head_base(_UHead&&) [with _UHead = int&; long unsigned int _Idx = 0; _Head = int]', inlined from 'constexpr std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(_UHead&&, _UTail&& ...) [with _UHead = int&; _UTail = {int&, int}; <template-parameter-2-3> = void; long unsigned int _Idx = 0; _Head = int; _Tail = {int, int}]' at /usr/include/c++/12.2.1/tuple:292:38, inlined from 'constexpr std::tuple< <template-parameter-1-1> >::tuple(_UElements&& ...) [with _UElements = {int&, int&, int}; bool _Valid = true; typename std::enable_if<_TCC<_Valid>::__is_implicitly_constructible<_UElements ...>(), bool>::type <anonymous> = true; _Elements = {int, int, int}]' at /usr/include/c++/12.2.1/tuple:744:54, inlined from 'int main()' at main.cpp:47:11: /usr/include/c++/12.2.1/tuple:200:11: warning: 'x' may be used uninitialized [-Wmaybe-uninitialized] 200 | : _M_head_impl(std::forward<_UHead>(__h)) { } | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:23:15: note: 'x' was declared here 23 | int n, m, x, y, p, cnt = 0; | ^