leetcode-----3484

Design Spreadsheet //code in java class Spreadsheet { public Spreadsheet(int rows) {}

public void setCell(String cell, int value) { spreadsheet.put(cell, value); }

public void resetCell(String cell) { spreadsheet.put(cell, 0); }

public int getValue(String formula) { final int i = formula.indexOf('+'); return getToken(formula.substring(1, i)) + getToken(formula.substring(i + 1)); }

private Map<String, Integer> spreadsheet = new HashMap<>();

private int getToken(final String token) { return Character.isDigit(token.charAt(0)) ? Integer.parseInt(token) : spreadsheet.getOrDefault(token, 0); } }