Compilare: main.cpp: In function 'bool isIn(std::__cxx11::string, std::__cxx11::string)': main.cpp:23:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int st = 0; st < s.length(); st++) ~~~^~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int st = 0; st < s[0].length(); st++) ~~~^~~~~~~~~~~~~~~ main.cpp:31:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l = 1; st+l <= s[0].length(); l++) { ~~~~~^~~~~~~~~~~~~~~~