Update Extra

Ashishgup1 · web-flow · commit 1198b1cc6659 · 2020-01-10T16:24:13.000+05:30
diff --git a/Extra b/Extra
@@ -92,6 +92,7 @@
 //Problem 4 ([N/x] ranges): https://www.hackerrank.com/contests/hourrank-7/challenges/tile-painting-revisited/problem
 //Problem 5 (KMP + DP): https://codeforces.com/problemset/problem/1163/D
 //Problem 6 (Matrix + Linearity of Exp): https://codeforces.com/problemset/problem/1042/E
+//Problem 7 (Rerooting): https://codeforces.com/contest/1187/problem/E
 
 (https://www.hackerearth.com/practice/math/number-theory/basic-number-theory-2/practice-problems/algorithm/numbers-summation/)
 Resources:
