摘要：
public int[] constructArr(int[] a) { int len = a.length; if(len == 0) return new int[0]; int[] b = new int[len]; return multiply(a,b,len); } private i 阅读全文
摘要：
public int add(int a, int b) { int sum ,carry; do{ sum = a^b; carry = (a&b)<<1; a = sum; b = carry; }while(carry!=0); return a; } 阅读全文
摘要：
public int lastRemaining(int n, int m) { ArrayList<Integer> list = new ArrayList<>(n); for (int i = 0; i < n; i++) { list.add(i); } int idx = 0; while 阅读全文