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1021.cpp
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1021.cpp
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__________________________________________________________________________________________________
sample 4 ms submission
class Solution {
public:
string removeOuterParentheses(string S) {
int num_left = 0;
int num_right = 0;
int break_point = 0;
string ret = "";
for (int idx = 0; idx < S.length(); ++idx) {
if (S[idx] == '(') {
num_left++;
}
else {
num_right++;
}
if (num_left == num_right) {
ret.append(S.substr(break_point+1, idx-break_point-1));
num_left = num_right = 0;
break_point = idx+1;
}
}
return ret;
}
};
__________________________________________________________________________________________________
sample 8 ms submission
class Solution {
public:
string removeOuterParentheses(string S) {
int n = S.length();
int i = 0,j = 0;
int a = 0;
string ans = "";
while(j < n){
if(S[j] == '('){
a -= 1;
}
else if(S[j] == ')'){
a += 1;
}
if(a == 0 && j > 0){
int k = i+1;
while(k<j){
ans += S[k];
k++;
}
i = j + 1;
}
j++;
}
return ans;
}
};
__________________________________________________________________________________________________
class Solution {
public:
string removeOuterParentheses(string S) {
string res;
int opened = 0;
for (char c : S) {
if (c == '(' && opened++ > 0) res += c;
if (c == ')' && opened-- > 1) res += c;
}
return res;
}
};