Minimum Cost to Set Cooking Time LeetCode solution in Java

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class Solution {
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  public int minCostSetTime(int startAt, int moveCost, int pushCost, int tar) {
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    int min = tar / 60, sec = tar % 60, minCost = (moveCost + pushCost) * 4;
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    if (min > 99) {
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      min--;
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      sec += 60;
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    } // this is required to do because if tar>=6000 then min is 100 which is not possible as it
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    // atmost can be 99mins
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    while (min >= 0 && sec <= 99) { // this while loop will work for atmost 2 iterations
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      tar = min * 100 + sec;
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      char arr[] = ("" + tar).toCharArray();
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      int sameMove = 0;
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      for (int i = 0; i < arr.length - 1; i++) if (arr[i] == arr[i + 1]) sameMove++;
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      if (startAt == arr[0] - '0')
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        minCost = Math.min(minCost, pushCost * arr.length + moveCost * (arr.length - 1 - sameMove));
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      else minCost = Math.min(minCost, pushCost * arr.length + moveCost * (arr.length - sameMove));
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      min--;
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      sec += 60;
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    }
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    return minCost;
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  }
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}