Compilare: main.cpp: In function 'int main()': main.cpp:15:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<strlen(a);i++) { ~^~~~~~~~~~ main.cpp:21:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<strlen(b)) { ~^~~~~~~~~~ main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j==strlen(a)) { ~^~~~~~~~~~~ main.cpp:37:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int o=0;o<v.size();o++) { ~^~~~~~~~~