Compilare: main.cpp: In function 'int lcp(std::__cxx11::string, std::__cxx11::string)': main.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.size() && i < b.size() && a[i] == b[i]; nr++, i++); ~~^~~~~~~~~~ main.cpp:16:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.size() && i < b.size() && a[i] == b[i]; nr++, i++); ~~^~~~~~~~~~ main.cpp: At global scope: main.cpp:21:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^