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20.cpp
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20.cpp
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class Solution {
public:
bool isValid(string s) {
int top = 0;
char *stk = new char[s.length() + 1];
for(int i = 0; i < s.length(); ++i){
if(s[i] == '(' || s[i] == '{' || s[i] == '['){
stk[top] = s[i];
++top;
}
else{
if(top == 0){
return false;
}
else if(s[i] == ')'){
if(stk[top-1] != '('){
return false;
}
else{
--top;
}
}
else if(s[i] == '}'){
if(stk[top-1] != '{'){
return false;
}
else{
--top;
}
}
else if(s[i] == ']'){
if(stk[top-1] != '['){
return false;
}
else{
--top;
}
}
//else{
// --top;
//}
}
}
if(top == 0){
return true;
}
else return false;
}
};