求1到100中缺一个数, 求1到100缺两个数

help_arry = new int[2] {-1, -1}; for (int i = 0; i < arr.length; i++) {  if (i != arr[i]) {   t = arr[i];   arr[i] = -1;   while (t ! = -1) {    if (t > 99) {     help_arry[t-99] = t;     t = -1;         } else {     y = arr[t];     arr[t] = t;     t = y;    }       }  } }