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301.java
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301.java
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__________________________________________________________________________________________________
sample 1 ms submission
class Solution {
public List<String> removeInvalidParentheses(String s) {
List<String> res = new ArrayList<>();
remove(s, 0, 0, res, new char[]{'(', ')'});
return res;
}
public void remove(String s, int ind, int pre_rm, List<String> res, char[] par) {
int cnt = 0;
for(int i=ind; i<s.length(); i++) {
if(s.charAt(i)==par[0]) cnt++;
if(s.charAt(i)==par[1]) cnt--;
if(cnt<0) {
for(int j=pre_rm; j<=i; j++) {
if(s.charAt(j)==par[1] && (j==pre_rm||s.charAt(j-1)!=par[1])) {
String ns = s.substring(0, j)+s.substring(j+1);
remove(ns, i, j, res, par);
}
}
return;
}
}
String reverse = new StringBuffer(s).reverse().toString();
if(par[0]=='(') remove(reverse, 0, 0, res, new char[]{')','('});
else res.add(reverse);
}
}
__________________________________________________________________________________________________
sample 34592 kb submission
class Solution {
public List<String> removeInvalidParentheses(String s) {
List<String> ret = new ArrayList<>();
if (s == null) return ret;
_find(ret, new StringBuilder(s), '(', ')', 0, 0);
return ret;
}
private void _find(List<String> ret, StringBuilder sb, char lb, char rb, int start, int deleteFrom) {
int count = 0;
for (int i = start; i < sb.length(); i++) {
if (sb.charAt(i) == lb) count++;
if (sb.charAt(i) == rb) {
count--;
if (count < 0) {
for (int j = deleteFrom; j <= i; j++) {
if (sb.charAt(j) == rb) {
if (j == deleteFrom || sb.charAt(j-1) != rb) {
sb.deleteCharAt(j);
//System.out.println(start + " :" + j + "in loop 1" + sb);
_find(ret, sb, lb, rb, start, j);
// System.out.println(start + " :" + j + "in loop 2" + sb);
sb.insert(j, rb);
}
}
}
return;
}
}
}
if (count == 0) {
if (lb == '(') {
ret.add(sb.toString());
} else {
ret.add(sb.reverse().toString());
sb.reverse();
}
} else if (lb == '(') {
_find(ret, sb.reverse(), ')', '(', 0, 0);
sb.reverse();
}
}
}
__________________________________________________________________________________________________