Add stack-queue module: ten stack and queue interview problems, monotonic stack, min stack, queue from stacks and stack from a queue, brute-force cross-checks, dry-run traces, operation counts, pitfalls (11 tests)

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b6nxynun5JFivebVb1
2026-11-12 22:35:43 +05:30
parent c5c435ae20
commit b9aeb78b24
36 changed files with 2164 additions and 0 deletions
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+Next greater element: the stack of pending indices, step by step
+================================================================
+
+input [2, 1, 2, 4, 3]
+  i=0 value=2: push 0   pending(top first) = [0]
+  i=1 value=1: push 1   pending(top first) = [1, 0]
+  i=2 value=2: pop index 1 (value 1) -> its answer is 2; push 2   pending(top first) = [2, 0]
+  i=3 value=4: pop index 2 (value 2) -> its answer is 4; pop index 0 (value 2) -> its answer is 4; push 3   pending(top first) = [3]
+  i=4 value=3: push 4   pending(top first) = [4, 3]
+  indices still pending have no greater element to their right: [4, 3] -> stay -1
+result [4, 2, 4, -1, -1]
+
+dailyTemperatures [73, 74, 75, 71, 69, 72, 76, 73]
+  = [1, 1, 4, 2, 1, 1, 0, 0]
+
+nextGreaterCircular [1, 2, 1] = [2, -1, 2]
+nextGreaterSubset [4, 1, 2] within [1, 3, 4, 2] = [-1, 3, -1]