จำนวน 1=2 ในชื่อของผลรวม

รหัสตัวอย่าง

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วิธีที่จะเป็นตัวแทนของเบอร์เป็นผลรวมของ 1 และ 2 คน

// The number of ways to represent a number with only 1s and 2s is 
// equal to (n+1)th fibonacci number 
public static int nthFibonacciNumber(int n) {
	int[] arr = new int[n+2];
  	arr[0] = 0;
  	arr[1] = 1;
  	for(int i = 2; i <= n; i++) {
    	arr[i] = arr[i - 1] + arr[i -2];
    }
  	return arr[n];
}

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