Compilare: main.cpp: In function 'int main()': main.cpp:75:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for (i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:77:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | while (i < s.size() && s[i] >= '0' && s[i] <= '9') { | ~~^~~~~~~~~~ main.cpp:116:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 116 | for (i = 0; i < vreuniune.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp:124:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 124 | for (i = 0; i < vsol.size(); i++) | ~~^~~~~~~~~~~~~