fix: update solutions to lc problem: No.53 (#3740)

close #3734

Author: yanglbme

solution/0000-0099/0053.Maximum Subarray/README.md

@@ -67,23 +67,23 @@ tags:
 
 ### 方法一：动态规划
 
-我们定义 $f[i]$ 表示以元素 $nums[i]$ 为结尾的连续子数组的最大和，初始时 $f[0] = nums[0]$，那么最终我们要求的答案即为 $\max_{0 \leq i < n} f[i]$。
+我们定义 $f[i]$ 表示以元素 $\textit{nums}[i]$ 为结尾的连续子数组的最大和，初始时 $f[0] = \textit{nums}[0]$，那么最终我们要求的答案即为 $\max_{0 \leq i < n} f[i]$。
 
 考虑 $f[i]$，其中 $i \geq 1$，它的状态转移方程为：
 
 $$
-f[i] = \max \{ f[i - 1] + nums[i], nums[i] \}
+f[i] = \max(f[i - 1] + \textit{nums}[i], \textit{nums}[i])
 $$
 
 也即：
 
 $$
-f[i] = \max \{ f[i - 1], 0 \} + nums[i]
+f[i] = \max(f[i - 1], 0) + \textit{nums}[i]
 $$
 
 由于 $f[i]$ 只与 $f[i - 1]$ 有关系，因此我们可以只用一个变量 $f$ 来维护对于当前 $f[i]$ 的值是多少，然后进行状态转移即可。答案为 $\max_{0 \leq i < n} f$。
 
-时间复杂度 $O(n)$，其中 $n$ 为数组 $nums$ 的长度。我们只需要遍历一遍数组即可求得答案。空间复杂度 $O(1)$，我们只需要常数空间存放若干变量。
+时间复杂度 $O(n)$，其中 $n$ 为数组 $\textit{nums}$ 的长度。空间复杂度 $O(1)$。
 
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solution/0000-0099/0053.Maximum Subarray/README_EN.md

@@ -64,23 +64,23 @@ tags:
 
 ### Solution 1: Dynamic Programming
 
-We define $f[i]$ to represent the maximum sum of the continuous subarray ending with the element $nums[i]$. Initially, $f[0] = nums[0]$. The final answer we are looking for is $\max_{0 \leq i < n} f[i]$.
+We define $f[i]$ to represent the maximum sum of a contiguous subarray ending at element $\textit{nums}[i]$. Initially, $f[0] = \textit{nums}[0]$. The final answer we seek is $\max_{0 \leq i < n} f[i]$.
 
-Consider $f[i]$, where $i \geq 1$, its state transition equation is:
+Consider $f[i]$ for $i \geq 1$. Its state transition equation is:
 
 $$
-f[i] = \max \{ f[i - 1] + nums[i], nums[i] \}
+f[i] = \max(f[i - 1] + \textit{nums}[i], \textit{nums}[i])
 $$
 
-Which is also:
+That is:
 
 $$
-f[i] = \max \{ f[i - 1], 0 \} + nums[i]
+f[i] = \max(f[i - 1], 0) + \textit{nums}[i]
 $$
 
-Since $f[i]$ is only related to $f[i - 1]$, we can use a single variable $f$ to maintain the current value of $f[i]$, and then perform state transition. The answer is $\max_{0 \leq i < n} f$.
+Since $f[i]$ is only related to $f[i - 1]$, we can use a single variable $f$ to maintain the current value of $f[i]$ and perform the state transition. The answer is $\max_{0 \leq i < n} f$.
 
-The time complexity is $O(n)$, where $n$ is the length of the array $nums$. We only need to traverse the array once to get the answer. The space complexity is $O(1)$, we only need constant space to store several variables.
+The time complexity is $O(n)$, where $n$ is the length of the array $\textit{nums}$. The space complexity is $O(1)$.
 
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