gerador de string
static String isBalanced(String s) {
Stack<Character> str = new Stack();
String ans = "YES";
String no = "NO";
boolean answer = true;
for(int i=0; i<s.length(); i++){
char ch = s.charAt(i);
if(ch == '{' || ch == '[' || ch == '('){
str.push(ch);
continue;
}
if(str.isEmpty()){
return no;
}
if(ch == ')'){
if(str.peek() == '('){
str.pop();
}else{
answer = false;
break;
}
}
if(ch == ']'){
if(str.peek() == '['){
str.pop();
}else{
answer = false;
break;
}
}
if(ch == '}'){
if(str.peek() == '{'){
str.pop();
}else{
answer = false;
break;
}
}
}
if(!str.isEmpty()){
answer = false;
}
if(answer)
return ans;
else
return no;
}
Excited Earthworm