diff --git a/content/graph/BinaryLifting.h b/content/graph/BinaryLifting.h
index b10b6c327..947d794e8 100644
--- a/content/graph/BinaryLifting.h
+++ b/content/graph/BinaryLifting.h
@@ -12,8 +12,7 @@
 #pragma once
 
 vector<vi> treeJump(vi& P){
-	int on = 1, d = 1;
-	while(on < sz(P)) on *= 2, d++;
+	int d = sz(P) < 2 ? 0 : 1 + __lg(sz(P) - 1);
 	vector<vi> jmp(d, P);
 	rep(i,1,d) rep(j,0,sz(P))
 		jmp[i][j] = jmp[i-1][jmp[i-1][j]];