四道题，分数分别为10，20，30，40。
本人结果为100%，100%，92%，100%。
第一题100%
package netease;
import java.util.*;
public class Main1 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int target = sc.nextInt()+sc.nextInt();
int bias = sc.nextInt();
int[] teams = new int[sc.nextInt()];
for(int i=0;i<teams.length;i++){
teams[i] = sc.nextInt()+sc.nextInt();
}
int[] person = new int[sc.nextInt()];
for(int i=0;i<person.length;i++){
person[i] = sc.nextInt();
}
System.out.println(getPerson(person, target, bias)+getTeams(teams, target, bias));
}
public static int getPerson(int[] person, int target, int bias){
int ret = 0;
for(int i=0;i<person.length;i++){
for(int j=i+1;j<person.length;j++){
if(Math.abs(person[i]+person[j]-target)<=bias) ret++;
}
}
return ret;
}
public static int getTeams(int[] teams, int target, int bias){
int ret = 0;
for(int i:teams){
if(Math.abs(i-target)<=bias) ret++;
}
return ret;
}
} 第二题100% package netease;
import java.util.*;
public class Main2 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int[] time = new int[4];
for(int i=0;i<4;i++){
time[i] = sc.nextInt();
}
int[] road = new int[n];
for(int i=0;i<n;i++){
road[i] = sc.nextInt();
}
System.out.println(solve(road, time));
}
/**
*
* @param road
* @param time 0-平移 1-爬坡 2-下坡 3-切换
* @return
*/
public static int solve(int[] road, int[] time){
int l = road.length;
if(l==0) return 0;
int[][] dp = new int[2][l];
dp[0][l-1] = 0;
dp[1][l-1] = 0;
for(int i=l-2;i>=0;i--){
int gap = road[i]-road[i+1];
if(gap>=2){
dp[0][i] = dp[0][i+1] + time[2];
dp[1][i] = dp[0][i+1] + time[2] + time[3];
}else if(gap<=-2){
dp[0][i] = dp[1][i + 1] + time[2] + time[3];
dp[1][i] = dp[1][i + 1] + time[2];
}else{
int t1 = 0, t2 = 0;
if(gap==0){
t1 = time[0];
t2 = time[0];
}else if(gap==1){
t1 = time[2];
t2 = time[1];
}else{
t1 = time[1];
t2 = time[2];
}
dp[0][i] = Math.min(dp[1][i+1] + time[3] + t2, dp[0][i+1] + t1);
dp[1][i] = Math.min(dp[0][i+1] + time[3] + t1, dp[1][i+1] + t2);
}
}
return dp[0][0];
}
}
第三题92%，还差个判断是否循环引用，懒得搞了 package netease;
import java.util.*;
public class Main3 {
//null 8% error 8%
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int count = sc.nextInt();
sc.nextLine();
String[] input = new String[count];
for(int i=0;i<count;i++){
input[i] = sc.nextLine();
}
String query = sc.nextLine();
System.out.println(solve(input, query));
}
static HashMap<String, String> map;
static HashMap<String, List<String>> waitq;
public static String solve(String[] input, String query){
if(input.length==0) return "NULL";
map = new HashMap<>();
waitq = new HashMap<>();
for(String s:input){
int idx = 0;
while(idx<s.length()&&s.charAt(idx)==' ') idx++;
//为空行或者注释行
if(idx==s.length()||s.charAt(idx)=='#') continue;
int start = idx;
while(idx<s.length()&&s.charAt(idx)!=' '&&s.charAt(idx)!='=') idx++;
if(idx>=s.length()||idx==start) return "ERROR";
String key = s.substring(start, idx);
idx = s.indexOf('=', idx);
if(idx<0) return "ERROR";
idx++;
//去= value中间的空格
while(idx<s.length()&&s.charAt(idx)==' ') idx++;
if(idx>=s.length()) return "ERROR";
int end = s.length()-1;
while(s.charAt(end)==' ') end--;
String value = s.substring(idx, end+1);
if(value.indexOf('{')<0){
if(value.indexOf('}')<0){
map.put(key, value);
}else{
return "ERROR";
}
}
StringBuilder sb = new StringBuilder(value);
String rst = get(sb, 0);
if(rst.equals("ERROR")) return "ERROR";
map.put(key, sb.toString());
}
int left = 0, right = query.length()-1;
while(left<query.length()&&query.charAt(left)==' ') left++;
while(right>=left&&query.charAt(right)==' ') right--;
String q = query.substring(left, right+1);
if(!map.containsKey(q)) return "NULL";
return map.get(q);
}
public static String get(StringBuilder sb, int idx){
while(idx<sb.length()&&sb.charAt(idx)!='{'&&sb.charAt(idx)!='}') idx++;
if(idx>=sb.length()) return "";
if(sb.charAt(idx)=='}') return "ERROR";
int right = sb.indexOf("}", idx);
if(right<0||idx+1==right) return "ERROR";
String want = sb.substring(idx+1, right);
if(map.containsKey(want)){
sb.delete(idx, right+1);
sb.insert(idx, map.get(want));
}else{
return "ERROR";
}
return get(sb, idx);
}
} 第四题，其实想明白了就是简单的数学题 package netease;
import java.util.*;
public class Main4 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int len = sc.nextInt()*100;
int count = sc.nextInt();
int range = sc.nextInt()*100;
int[] loc = new int[count];
int[] v = new int[count];
for(int i=0;i<count;i++){
loc[i] = sc.nextInt()*100;
}
for(int i=0;i<count;i++){
v[i] = sc.nextInt();
}
int ret = solve(loc, v, range, len);
StringBuilder sb = new StringBuilder();
sb.append(ret/100);
ret %= 100;
sb.append('.');
if(ret<10){
sb.append('0');
sb.append(ret);
}else{
sb.append(ret);
}
System.out.println(sb.toString());
}
public static int solve(int[] loc, int[] v, int range, int len){
if(range*2>=len) return 0;
int gap = loc[0]%len-range;
if(gap<0){
gap = -gap;
for(int i=0;i<loc.length;i++){
loc[i] = (loc[i]+gap)%len;
}
}
int l1 = (loc[0]-range+len)%len;
int r1 = (loc[0]+range)%len;
int ret = 0;
for(int i=1;i<loc.length;i++){
int at = loc[i]%len;
if(at>=l1&&at<=r1) continue;
if(at<l1){
if(v[i]>v[0]){
ret = Math.max(ret, (l1-at)/(v[i]-v[0]));
}else{
ret = Math.max(ret, (at+len-r1)/(v[0]-v[i]));
}
}else{
if(v[i]>v[0]){
ret = Math.max(ret, (l1+len-at)/(v[i]-v[0]));
}else{
ret = Math.max(ret, (at-r1)/(v[0]-v[i]));
}
}
}
return ret;
}
}
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