Compilare: main.cpp: In function 'void init()': main.cpp:47:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(int i = 0; i < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp:49:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for(int j = 0; j < s.size(); j ++) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:125:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 125 | for(int k = 0; k < s.size(); k ++) | ~~^~~~~~~~~~ main.cpp:164:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 164 | for(int i = 0; i < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp:171:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 171 | for(int l = 1; l < s.size(); l ++) | ~~^~~~~~~~~~ main.cpp:173:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 173 | for(int i = 0; i + l < s.size(); i ++) | ~~~~~~^~~~~~~~~~