1221. Split a String in Balanced Strings

#### QUESTION:

Balanced strings are those who have equal quantity of ‘L’ and ‘R’ characters.

Given a balanced string s split it in the maximum amount of balanced strings.

Return the maximum amount of splitted balanced strings.

Example 1:

Input: s = “RLRRLLRLRL” Output: 4 Explanation: s can be split into “RL”, “RRLL”, “RL”, “RL”, each substring contains same number of ‘L’ and ‘R’. Example 2:

Input: s = “RLLLLRRRLR” Output: 3 Explanation: s can be split into “RL”, “LLLRRR”, “LR”, each substring contains same number of ‘L’ and ‘R’. Example 3:

Input: s = “LLLLRRRR” Output: 1 Explanation: s can be split into “LLLLRRRR”. Example 4:

Input: s = “RLRRRLLRLL” Output: 2 Explanation: s can be split into “RL”, “RRRLLRLL”, since each substring contains an equal number of ‘L’ and ‘R’

Constraints:

1 <= s.length <= 1000 s[i] = ‘L’ or ‘R’

#### EXPLANATION:

easy的题目，看到这种配对的，可以直接考虑采用stack的数据结构。

#### SOLUTION:

``````class Solution {
public int balancedStringSplit(String s) {
if(s.length()==0) return 0;
int result = 0;
char[] chars = s.toCharArray();
Stack<Character> stack = new Stack<>();
stack.push(chars);
for(int i = 1;i<chars.length;i++){
if(stack.size()==0 || chars[i]==stack.peek())
stack.push(chars[i]);
else
stack.pop();
if(stack.size()==0) result++;
}
return result;
}
}
``````
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