s0135

include/s0135_candy.hpp

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+#ifndef S0135_CANDY_HPP
+#define S0135_CANDY_HPP
+
+#include <algorithm>
+#include <vector>
+
+using namespace std;
+
+class S0135 {
+ public:
+  int candy(vector<int>& ratings);
+};
+
+#endif

src/s0135_candy.cpp

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+#include "s0135_candy.hpp"
+
+int S0135::candy(vector<int>& ratings) {
+  int len = ratings.size();
+  int result{0};
+  vector<int> candy(len, 1);
+  // 从前往后
+  for (int i{1}; i < len; ++i) {
+    if (ratings[i] > ratings[i - 1]) candy[i] = candy[i - 1] + 1;
+  }
+  // 从后往前
+  for (int i = len - 2; i >= 0; --i) {
+    if (ratings[i] > ratings[i + 1]) candy[i] = max(candy[i], candy[i + 1] + 1);
+    // 顺便统计结果
+    result += candy[i + 1];
+  }
+  return result + candy[0];
+}

tests/s0135_candy.cpp

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+#include "s0135_candy.hpp"
+
+#include <gtest/gtest.h>
+
+TEST(Problem135, Case1) {
+  vector<int> ratings{1, 0, 2};
+  int expected{5};
+  S0135 solution;
+  EXPECT_EQ(solution.candy(ratings), expected);
+}
+
+TEST(Problem135, Case2) {
+  vector<int> ratings{1, 2, 2};
+  int expected{4};
+  S0135 solution;
+  EXPECT_EQ(solution.candy(ratings), expected);
+}