华为9.20笔试，591分

第一题

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] S = new int[n];
        HashMap<Integer,List<Integer>> map = new HashMap<>();
        for(int i=0;i<n;i++)
        {
            S[i] = in.nextInt();
            map.computeIfAbsent(S[i],k->new ArrayList<>());
            map.get(S[i]).add(i);
        }
        int t = in.nextInt();
        List<Integer> list = map.get(t);
        
        int begin = -1;
        int end = -1;
        if(list==null){
            System.out.print(begin+" "+end);
            return;
        }
        int last = list.get(0);
        for(int i=1;i<list.size();i++){
            int num = list.get(i);
            if(num!=last+1){
                begin = num;
                end = last;
                System.out.print(begin+" "+end);
                return;
            }
            last = num;
        }
        begin = list.get(0);
        end = list.get(list.size()-1);
        System.out.print(begin+" "+end);
    }
}

第二题bfs，代码丢了

第三题 通过用例97%，剩余用例cpu错误

import java.util.*;

public class Main {
    static HashMap<String,Long> vars = new HashMap<>();
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while(in.hasNextLine()){
            String line = in.nextLine();
            if(line.charAt(0)=='l'){
                handleDefine(line);
            }
            if(line.charAt(0)=='o'){
                handleOut(line);
            }
        }
    }
    static int mark;

    static int state;
    public static void handleOut(String line){
        mark = 4;
        StringBuilder varNameBuilder = new StringBuilder();
        if(!checkVarName(line.charAt(mark))||('0'<=line.charAt(mark)&&line.charAt(mark)<='9')){
            System.out.println("<syntax-error>");
            return;
        }
        while(mark<line.length()&&checkVarName(line.charAt(mark))){
            varNameBuilder.append(line.charAt(mark));
            mark++;
        }
        String varName = varNameBuilder.toString();
        if(vars.get(varName)==null){
            System.out.println("<undefined>");
        }else if(vars.get(varName)>Integer.MAX_VALUE){
            System.out.println("<overflow>");
        }else if(vars.get(varName)<Integer.MIN_VALUE){
            System.out.println("<underflow>");
        }else{
            System.out.println(vars.get(varName));
        }
    }
    public static void handleDefine(String line){
        mark = 4;
        state = 0;
        StringBuilder varNameBuilder = new StringBuilder();
        if(!checkVarName(line.charAt(mark))||('0'<=line.charAt(mark)&&line.charAt(mark)<='9')){
            System.out.println("<syntax-error>");
            return;
        }
        while(mark<line.length()&&checkVarName(line.charAt(mark))){
            varNameBuilder.append(line.charAt(mark));
            mark++;
        }
        if(mark<line.length()&&(line.charAt(mark)!=' '&&line.charAt(mark)!='=')){
            System.out.println("<syntax-error>");
            return;
        }
        String varName = varNameBuilder.toString();
        skipSpace(line);
        mark++;
        skipSpace(line);
        long res = handleCount(line);
        if(state==0) {
            vars.put(varName, res);
        }
    }
    public static long handleCount(String line){
        long res = getVarOrInteger(line);
        if(state==-1) return 0;
        while (mark<line.length()){
            skipSpace(line);
            char c = line.charAt(mark);
            switch (c){
                case '+':{
                    mark++;
                    skipSpace(line);
                    res += getVarOrInteger(line);
                    if(state==-1) return 0;
                    break;
                }
                case '-':{
                    mark++;
                    skipSpace(line);
                    res -= getVarOrInteger(line);
                    break;
                }
                case '*':{
                    mark++;
                    skipSpace(line);
                    res *= getVarOrInteger(line);
                    break;
                }
                case '/':{
                    mark++;
                    skipSpace(line);
                    res /= getVarOrInteger(line);
                    break;
                }
            }
            skipSpace(line);
        }
        return res;
    }

    public static long getVarOrInteger(String line){
        StringBuilder varBuilder = new StringBuilder();
        boolean beginByInt =false;
        if(!checkVarName(line.charAt(mark))){
            if(line.charAt(mark)!='-'){
                System.out.println("<syntax-error>");
                state = -1;
                return 0;
            }
        }
        if('0'<=line.charAt(mark)&&line.charAt(mark)<='9'){
            beginByInt = true;
        }
        while(mark<line.length()&&checkVarName(line.charAt(mark))){
            varBuilder.append(line.charAt(mark));
            mark++;
        }
        if(varBuilder.length()==0) return 0;
        long res = 0;
        String var = varBuilder.toString();
        try{
            res = Long.parseLong(var);
        }catch (Exception e){
            if(beginByInt){
                System.out.println("<syntax-error>");
                state = -1;
                return 0;
            }
            if(vars.get(var)!=null){
                res = vars.get(var);
            }else{
                state = -1;
                return res;
            }
        }
        return res;
    }
    public static boolean checkVarName(char c){
        if(('a'<=c&&c<='z')||'A'<=c&&c<='Z'){
            return true;
        }
        if('0'<=c&&c<='9') return true;
        return c == '_';
    }
    public static void skipSpace(String line){
        while(mark<line.length()&&line.charAt(mark)==' ') mark++;
    }
}