Kunal Mandal
Lv.1@kunalmandal · joined Oct 2026
Backend engineer who still enjoys a good greedy problem.
7 submissions in the past year
Solved problems
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Badges
All badges →Valid Parentheses
Accepted · Java · 0.23s
Valid Palindrome
Accepted · Java · 0.28s
Reverse Bits
Accepted · Java · 0.29s
Reverse Bits
Wrong Answer · Java · 1.90s
Ransom Note
Accepted · Java · 0.57s
Is Subsequence
Accepted · Java · 0.34s
Roman to Integer
Accepted · Java · 0.59s
Learning paths
Explore →Companies practiced
Explore →Certifications
Data Structures & Algorithms Specialist
Earned Oct 18, 2026 · Verify ↗
Competitive Programming Champion
Earned Oct 17, 2026 · Verify ↗
Stack Specialist
Earned Oct 17, 2026 · Verify ↗
DSA Fundamentals Certificate
Earned Oct 16, 2026 · Verify ↗
DSA Intermediate Certificate
Earned Oct 16, 2026 · Verify ↗
Graph Algorithms Expert
Earned Oct 13, 2026 · Verify ↗