Number (2): Everything in this space must add up to 2. The answer is 2-1, placed horizontally; 1-4, placed vertically.
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- assignment: Array of booleans. If the formula is satisfiable provide an assignment for each variable from 1 to N. If the formula is not satisfiable this field is null.
while (stack.length 0 && nums[stack[stack.length - 1]] <= curHeight) {