Untitled

class Solution {
    public String stringShift(String s, int[][] shift) {
        int sum = 0;
        for (int[] sh : shift) {
            if (sh[0] == 1) {
                sum += sh[1];
            } else {
                sum -= sh[1];
            }
        }

        int n = s.length();
        char[] answer = new char[n];
        if (sum < 0) {
            int j = n - 1;
            for (int i = 0; i < -sum; i++) {
                answer[j--] = s.charAt(i);
            }

            j = 0;
            for (int i = -sum; i < n; i++) {
                answer[j++] = s.charAt(i);
            }
        } else {
            int j = 0;
            for (int i = n - 1; i >= n - sum; i--) {
                answer[j++] = s.charAt(i);
            }

            for (int i = 0; j < n; i++, j++) {
                answer[j] = s.charAt(i);
            }
        }

        return new String(answer);
    }
}