Compilare: user.cpp: In function ‘int main()’: user.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(a); i++){ ^ user.cpp:55:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=path_fin[i].size(); i++) ^ user.cpp:56:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1; j<=path_fin[j].size(); j++){ ^ user.cpp:57:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(k<=path_fin[i].size()){ ^