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Create 0268_Week 05(java) #1343

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23 changes: 23 additions & 0 deletions Week_05/G20190343020268/0268_Week 05(java)
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Original file line number Diff line number Diff line change
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//NO.32 最长有效括号

class Solution {
public int longestValidParentheses(String s) {
if(null == s) return 0;

int len = s.length(), max = 0;
int[] d = new int[len];

for(int index = len-2; index >= 0; index--){
int symIndex = index+1+d[index+1];
if('(' == s.charAt(index) && symIndex < len && ')' == s.charAt(symIndex)){
d[index] = d[index+1]+2;
if(symIndex+1 < len){
d[index] += d[symIndex+1];
}
}

max = Math.max(max, d[index]);
}
return max;
}
}