民生银行2022届总行“民芯计划”校园招聘笔试编程题答案
两道题都AC了，大佬们提点意见，看看怎么能更好地优化啊？
第一题，成绩单排序
public static void main(String[] args){
Scanner in = new Scanner(System.in);
int n = in.nextInt();
ArrayList<String>[] gradeList = new ArrayList[n];
for(int i = 0;i < n;i++){
gradeList[i] = new ArrayList<>();
gradeList[i].add(in.next());
int chinGrade = in.nextInt();
int mathGrade = in.nextInt();
int engGrade = in.nextInt();
int sum = chinGrade + mathGrade + engGrade;
gradeList[i].add(String.valueOf(sum));
gradeList[i].add(String.valueOf(chinGrade));
gradeList[i].add(String.valueOf(mathGrade));
gradeList[i].add(String.valueOf(engGrade));
}
Arrays.sort(gradeList, new Comparator<ArrayList<String>>() { @Override public int compare(ArrayList<String> o1, ArrayList<String> o2) {
if(Integer.parseInt(o2.get(1)) != Integer.parseInt(o1.get(1))){
return Integer.parseInt(o2.get(1)) - Integer.parseInt(o1.get(1));
}else if(Integer.parseInt(o2.get(2)) != Integer.parseInt(o1.get(2))){
return Integer.parseInt(o2.get(2)) - Integer.parseInt(o1.get(2));
}else if(Integer.parseInt(o2.get(3)) != Integer.parseInt(o1.get(3))){
return Integer.parseInt(o2.get(3)) - Integer.parseInt(o1.get(3));
}else if(Integer.parseInt(o2.get(4)) != Integer.parseInt(o1.get(4))){
return Integer.parseInt(o2.get(4)) - Integer.parseInt(o1.get(4));
}else{
int i = 0;
while(i < Math.min(o1.get(0).length(),o2.get(0).length())){
if(o1.get(0).charAt(i) == o2.get(0).charAt(i)){ i++; }
else{ break; }
}
return Character.compare(o1.get(0).charAt(i),o2.get(0).charAt(i));
}
}
});
int chinGrade = 0,mathGrade = 0,engGrade =0,sum=0;
StringBuilder sb = new StringBuilder();
int rank = 0;
for(int i = 0; i < n;i++){
if(sum != Integer.parseInt(gradeList[i].get(1)) ||
chinGrade != Integer.parseInt(gradeList[i].get(2))||
mathGrade != Integer.parseInt(gradeList[i].get(3))||
engGrade != Integer.parseInt(gradeList[i].get(4))){
rank = i + 1;
}
sb.append("rank:" + rank + " name:")
.append(gradeList[i].get(0)+" total:")
.append(gradeList[i].get(1)+ " chinese:")
.append(gradeList[i].get(2)+ " math:")
.append(gradeList[i].get(3)+ " english:")
.append(gradeList[i].get(4));
System.out.println(sb);
sb.delete(0,sb.length());
sum = Integer.parseInt(gradeList[i].get(1));
chinGrade = Integer.parseInt(gradeList[i].get(2));
mathGrade = Integer.parseInt(gradeList[i].get(3));
engGrade = Integer.parseInt(gradeList[i].get(4));
}
} 第二题，测试菜单程序 public static void main(String[] args){
Scanner in = new Scanner(System.in);
String s = in.next();
if(s.charAt(0) == 'Q'){
System.out.println("Quit");
}
else if(s.charAt(0) == '1'){
int count = 0;
while(in.hasNextLine()){
s = in.nextLine();
if(s.trim().length() != 0){ count++; }
}
System.out.println(count);
}
else{
System.out.println("Wrong input, Please re-choose");
System.out.println("Menu Function Test");
System.out.println("1: Count Lines");
System.out.println("Q: Quit");
}
} 
查看3道真题和解析