Compilare: main.cpp: In function 'int main()': main.cpp:2:141: warning: statement has no effect [-Wunused-value] 2 | using namespace std;ifstream i("elmaj.in");ofstream o("elmaj.out");unordered_map<int,int> f;int main(){int n,m,k;i>>n;for(int i=0;i<n;i++){i>>k;if(++f[k]>f[m])m=k;}if(f[m]>=n/2+1)o<<m<<' '<<f[m];else o<<-1;} | ~^~~