网易雷火笔试8.14 总共过了1.8
第一题 AC
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String sin = sc.nextLine();
String substringIn = sin.substring(1, sin.length());
String[] splits = substringIn.split("]");
int[][] nums = new int[splits.length][];
for (int i = 0; i < splits.length; i++) {
splits[i] = splits[i].replace('[', ' ');
splits[i]=splits[i].replace(']',' ');
splits[i]=splits[i].replace(',',' ');
splits[i]= splits[i].replaceAll(" ","");
int[] ints = new int[splits[i].length()];
for (int j = 0; j < ints.length; j++) {
ints[j] = splits[i].charAt(j)-'0';
}
nums[i] = ints;
}
boolean[] isOpen = new boolean[nums.length];
isOpen[0] = true;
openFor(nums,isOpen,0);
boolean isOpenFull = true;
for (boolean b : isOpen) {
if(b==false) isOpenFull = false;
}
if (isOpenFull)
System.out.println("true");
else
System.out.println("false");
}
public static void openFor(int[][] nums,boolean[] isOpen,int index){
if(isOpen[index]==true){
for (int j = 0; j < nums[index].length;j++) {
if(isOpen[nums[index][j]]==false){
isOpen[nums[index][j]] = true;//打开
openFor(nums, isOpen, nums[index][j]);
}
}
}
} 第二题 暴力80%
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
int count=0;
for (int i = 25; i <=num; i++) {
String str = String.valueOf(i);
for (int j = 0; j < str.length()-1; j++) {
if(str.charAt(j)=='2'&&str.charAt(j+1)=='5'){
count++;
break;
}
}
}
System.out.println(count);
} 第三题题目太长了 没做了 
