Compilare: main.cpp: In function 'int main()': main.cpp:28:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (int start = 0; start < a[i].size(); ++start) | ~~~~~~^~~~~~~~~~~~~ main.cpp:31:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (int j = start; j < a[i].size(); ++j) | ~~^~~~~~~~~~~~~ main.cpp:43:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for (int start = 0; start < b[i].size(); ++start) | ~~~~~~^~~~~~~~~~~~~ main.cpp:46:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for (int j = start; j < b[i].size(); ++j) | ~~^~~~~~~~~~~~~ main.cpp:57:7: warning: this 'if' clause does not guard... [-Wmisleading-indentation] 57 | if (it.second == n) | ^~ main.cpp:60:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if' 60 | cout << nr << '\n'; | ^~~~