Made treap size comparisons inclusive

file.hpp

@@ -32,7 +32,7 @@ public:
 	two_lines split(line *l, count_type k) {
 		if(l == nullptr) return {nullptr, nullptr};
 
-		if(get_size(l->left) > k) {
+		if(get_size(l->left) >= k) {
 			// In the left subtree
 			auto two = split(l->left, k);
 			l->size -= get_size(two.first);
@@ -45,6 +45,7 @@ public:
 			return {l, two.second};
 		}
 	}
+
 	// Join two treaps
 	// Hopefully with working sizes
 	line* join(line *a, line *b) {
@@ -63,6 +64,7 @@ public:
 		}
 	}
 	line* join(two_lines two) { return join(two.first, two.second); }
+
 	// Find k-th line of file
 	line* find(line* l, count_type k) {
 		if(l == nullptr) return nullptr;