Compilare: main.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] 1 | #import<fstream> | ^~~~~~ main.cpp:2:74: warning: multi-character character constant [-Wmultichar] 2 | using namespace std;ifstream f("rmq.in");ofstream g("rmq.out");int a[18]['■'],n,i,j=-1,k;main(){f>>n>>k;while(i<n)f>>a[0][i++];while(j++<16)for(i=0;i<n;)a[j+1][i++]=min(a[j][i],a[j][i+(1<<j)]);for(;f>>i>>j;k=__lg(j-i),g<<min(a[k][i-1],a[k][j-(1<<k)])<<'\n');} | ^~~ main.cpp:2:90: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 2 | using namespace std;ifstream f("rmq.in");ofstream g("rmq.out");int a[18]['■'],n,i,j=-1,k;main(){f>>n>>k;while(i<n)f>>a[0][i++];while(j++<16)for(i=0;i<n;)a[j+1][i++]=min(a[j][i],a[j][i+(1<<j)]);for(;f>>i>>j;k=__lg(j-i),g<<min(a[k][i-1],a[k][j-(1<<k)])<<'\n');} | ^~~~ main.cpp: In function 'int main()': main.cpp:2:162: warning: operation on 'i' may be undefined [-Wsequence-point] 2 | using namespace std;ifstream f("rmq.in");ofstream g("rmq.out");int a[18]['■'],n,i,j=-1,k;main(){f>>n>>k;while(i<n)f>>a[0][i++];while(j++<16)for(i=0;i<n;)a[j+1][i++]=min(a[j][i],a[j][i+(1<<j)]);for(;f>>i>>j;k=__lg(j-i),g<<min(a[k][i-1],a[k][j-(1<<k)])<<'\n');} | ~^~