Compilare: main.cpp: In function 'void solve()': main.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < strlen(s2); i++) ~~^~~~~~~~~~~~ main.cpp:66:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < cuv[i].size(); k++) ~~^~~~~~~~~~~~~~~ main.cpp:75:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k <= cuv[i].size()) { ~~^~~~~~~~~~~~~~~~