Compilare: main.cpp:20:5: warning: first argument of 'int main(long long int, const char**)' should be 'int' [-Wmain] int main(ll argc, char const *argv[]) ^~~~ main.cpp: In function 'int main(long long int, const char**)': main.cpp:52:29: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized] } else if(v[i].first == a && v[i].second == b) { main.cpp:52:29: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]