Compilare: main.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<bits/stdc++.h> ^~~~~~ main.cpp:2:78: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] int v[3000001],n,k;std::ifstream i("sdo.in");std::ofstream o("sdo.out");main(){i>>n>>k;for(int i=0;i<n;i++)i>>v[i];std::nth_element(v,v+k-1,v+n);o<<v[k-1];} ^ main.cpp: In function 'int main()': main.cpp:2:109: warning: statement has no effect [-Wunused-value] int v[3000001],n,k;std::ifstream i("sdo.in");std::ofstream o("sdo.out");main(){i>>n>>k;for(int i=0;i<n;i++)i>>v[i];std::nth_element(v,v+k-1,v+n);o<<v[k-1];} ~^~~~~~