Compilare: main.cpp: In function 'int main()': main.cpp:27:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp:37:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < t.size(); ++i) { ~~^~~~~~~~~~ main.cpp:44:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (L == s.size()) { ~~^~~~~~~~~~~