fix: add cmath & algorithm header to mo.cpp

Author: realstealthninja

range_queries/mo.cpp

@@ -1,4 +1,7 @@
+#include <algorithm>
+#include <cmath>
 #include <iostream>
+
 using namespace std;
 const int N = 1e6 + 5;
 int a[N], bucket[N], cnt[N];