ST - RMQ
void ST_create(){
for(int i = 1; i <= n; i++)
F[i][0] = a[i];
int k = log2(n);
for(int j = 1; j <= k; j++)
for(int i = 1; i <= n - (1<<j) + 1; i++)
F[i][j] = max(F[i][j-1], F[i+(1<<(j-1))][j-1]);
}
int ST_query(int l, int r){
int k = log2(r-l+1);
return max(F[l][k], F[r-(1<<k)+1][k]);
}
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