Compilare: user.cpp: In function ‘int main()’: user.cpp:26:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(a); i++){ ^ user.cpp:56:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(k<=path_fin[i].size() and k <= path_fin[j].size()){ ^ user.cpp:56:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(k<=path_fin[i].size() and k <= path_fin[j].size()){ ^