From 83266bbc5b533a1608539537b87ce06a75299c79 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9C=D0=BE=D1=80=D0=B5=D0=B2=20=D0=90=D0=BB=D0=B5=D0=BA?=
 =?UTF-8?q?=D1=81=D0=B0=D0=BD=D0=B4=D1=80?= <hikjik@yandex.ru>
Date: Sat, 30 Sep 2023 13:53:24 +0300
Subject: [PATCH] 132 Pattern

---
 CMakeLists.txt                       |  1 +
 solutions/132-pattern/CMakeLists.txt |  1 +
 solutions/132-pattern/solution.hpp   | 28 ++++++++++++++++++++++++++++
 solutions/132-pattern/test.cpp       | 22 ++++++++++++++++++++++
 4 files changed, 52 insertions(+)
 create mode 100644 solutions/132-pattern/CMakeLists.txt
 create mode 100644 solutions/132-pattern/solution.hpp
 create mode 100644 solutions/132-pattern/test.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 333fb1be..219c62da 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,6 +23,7 @@ endfunction()
 enable_testing()
 
 add_task(01-matrix)
+add_task(132-pattern)
 add_task(3sum)
 add_task(3sum-closest)
 add_task(add-binary)
diff --git a/solutions/132-pattern/CMakeLists.txt b/solutions/132-pattern/CMakeLists.txt
new file mode 100644
index 00000000..3d9f6b6a
--- /dev/null
+++ b/solutions/132-pattern/CMakeLists.txt
@@ -0,0 +1 @@
+add_catch(test_132_pattern test.cpp)
diff --git a/solutions/132-pattern/solution.hpp b/solutions/132-pattern/solution.hpp
new file mode 100644
index 00000000..50ca5d0e
--- /dev/null
+++ b/solutions/132-pattern/solution.hpp
@@ -0,0 +1,28 @@
+#pragma once
+
+#include <climits>
+#include <stack>
+#include <vector>
+
+class Solution {
+public:
+  static bool find132pattern(const std::vector<int> &nums) {
+    int middle = INT_MIN;
+    std::stack<int> stack;
+
+    for (int i = nums.size() - 1; i >= 0; --i) {
+      if (nums[i] < middle) {
+        return true;
+      }
+
+      while (!stack.empty() && stack.top() < nums[i]) {
+        middle = stack.top();
+        stack.pop();
+      }
+
+      stack.push(nums[i]);
+    }
+
+    return false;
+  }
+};
diff --git a/solutions/132-pattern/test.cpp b/solutions/132-pattern/test.cpp
new file mode 100644
index 00000000..b1bb2fcb
--- /dev/null
+++ b/solutions/132-pattern/test.cpp
@@ -0,0 +1,22 @@
+#include <catch.hpp>
+
+#include <solution.hpp>
+
+TEST_CASE("Simple") {
+  {
+    std::vector<int> nums{1, 2, 3, 4};
+    REQUIRE_FALSE(Solution::find132pattern(nums));
+  }
+  {
+    std::vector<int> nums{3, 1, 4, 2};
+    REQUIRE(Solution::find132pattern(nums));
+  }
+  {
+    std::vector<int> nums{-1, 3, 2, 0};
+    REQUIRE(Solution::find132pattern(nums));
+  }
+  {
+    std::vector<int> nums{1, 0, 1, -4, -3};
+    REQUIRE_FALSE(Solution::find132pattern(nums));
+  }
+}