codewars-java/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu6/SimpleStringIndices.java at master · fartem/codewars-java · GitHub

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package com.smlnskgmail.jaman.codewarsjava.kyu6;

// https://www.codewars.com/kata/5a24254fe1ce0ec2eb000078
public class SimpleStringIndices {

    private final String input;
    private final int indexOfStart;

    public SimpleStringIndices(
            String input,
            int indexOfStart
    ) {
        this.input = input;
        this.indexOfStart = indexOfStart;
    }

    public int solution() {
        int openBrackets = 0;
        if (!(input.charAt(indexOfStart) == '(')) {
            return -1;
        }
        for (int i = indexOfStart; i < input.length(); i++) {
            if (input.charAt(i) == '(') {
                openBrackets++;
            }
            if (input.charAt(i) == ')') {
                openBrackets--;
            }
            if (openBrackets == 0) {
                return i;
            }
        }
        return -1;
    }

}