Compilare: main.cpp: In function 'int main()': main.cpp:25:41: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 25 | if(pTop == '(' and s.size() < n - i) { | ~~~~~~~~~^~~~~~~ main.cpp:34:41: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 34 | if(pTop == '[' and s.size() < n - i) { | ~~~~~~~~~^~~~~~~ main.cpp:43:41: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 43 | if(pTop == '{' and s.size() < n - i) { | ~~~~~~~~~^~~~~~~