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balanced_brackets.dart
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55 lines (46 loc) · 1.25 KB
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import 'package:test/test.dart';
import 'package:stack/stack.dart';
bool isBalancedBrackets(String string) {
Stack<String> stack = Stack();
List<String> openingBrackets = ['(', '{', '['];
final Map<String, String> matchingBracket = {'}': '{', ')': '(', ']': '['};
for (int i = 0; i < string.length; i++) {
var currentChar = string[i];
if (openingBrackets.contains(currentChar)) {
stack.push(currentChar);
} else {
if (stack.isNotEmpty) {
if (stack.top() == matchingBracket[currentChar]) {
stack.pop();
} else {
return false;
}
} else {
return false;
}
}
}
return stack.isEmpty;
}
void main() {
test(('Balanced Bracket'), () {
expect(isBalancedBrackets('([])(){}(())()()'), isTrue);
});
test(('Balanced Bracket'), () {
expect(isBalancedBrackets('()[]{}{'), isFalse);
});
test(('Balanced Bracket'), () {
expect(isBalancedBrackets('()()[{()})]'), isFalse);
});
test(('Balanced Bracket'), () {
expect(isBalancedBrackets('()([])'), isTrue);
});
test(('Balanced Bracket'), () {
expect(
isBalancedBrackets(
'(((((([[[[[[{{{{{{{{{{{{()}}}}}}}}}}}}]]]]]]))))))((([])({})[])[])[]([]){}(())',
),
isTrue,
);
});
}