Compilare: main.cpp: In function 'int main()': main.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<s.size(); i++){ ~^~~~~~~~~ main.cpp:25:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<t.size(); i++){ ~^~~~~~~~~ main.cpp:32:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (L == s.size()){ ~~^~~~~~~~~~~