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HJ71~HJ80 华为机试题库

HJ71 字符串通配符

题目:https://www.nowcoder.com/practice/43072d50a6eb44d2a6c816a283b02036?tpId=37&tqId=21294&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3FtpId%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=

先读入两个字符串a,b,然后进行大小写转换,统一转化成小写。字符串下标从1开始存储。dp[i][j]表示对于a的前i位字符串和b的前j位字符串是否能匹配,如果可以则为1,否则为0。

处理边界情况:dp[0][0]=1;即两串字符串都为空字符串时是匹配的。然后for(int i=1;i<=la;i++)if(a[i]=='*')dp[i][0]=1;else break;由于*可以对应空字符串,所以***的情况是可以和空字符串匹配的,所以要预处理为1.

状态转移方程:

- `a[i] == b[j]` 或 `a[i] == '?'` 且 `b[j]` 是合法字符时,`dp[i][j] = dp[i-1][j-1]`。
- `a[i] == '*'` 且 `b[j]` 是合法字符时:
- `dp[i][j] = dp[i-1][j-1]`:`*`匹配一个字符
- `dp[i][j] = dp[i][j-1]`:`*`匹配多个字符
- `dp[i][j] = dp[i-1][j]`:`*`匹配空字符

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 char a[110],b[110];
 4 int la,lb,dp[110][110];
 5 bool Check(char c){
 6     if(c>='a'&&c<='z')return 1;
 7     if(c>='0'&&c<='9')return 1;
 8     return 0;
 9 }
10 int main(){
11     scanf("%s",a+1);
12     scanf("%s",b+1);
13     la=strlen(a+1); lb=strlen(b+1);
14     for(int i=1;i<=la;i++)
15         if(a[i]>='A'&&a[i]<='Z')a[i]=a[i]-'A'+'a';
16     for(int i=1;i<=lb;i++)
17         if(b[i]>='A'&&b[i]<='Z')b[i]=b[i]-'A'+'a';
18     dp[0][0]=1;
19     for(int i=1;i<=la;i++) if(a[i]=='*')dp[i][0]=1;else break;
20     for(int i=1;i<=la;i++){
21         for(int j=1;j<=lb;j++){
22             if(a[i]==b[j])dp[i][j]=max(dp[i][j],dp[i-1][j-1]);
23             else if(a[i]=='?'&&Check(b[j]))dp[i][j]=max(dp[i][j],dp[i-1][j-1]);
24             else if(a[i]=='*'&&Check(b[j])){
25                 dp[i][j]=max(dp[i][j],dp[i-1][j-1]);
26                 dp[i][j]=max(dp[i][j],dp[i][j-1]);
27                 dp[i][j]=max(dp[i][j],dp[i-1][j]);
28             }
29         }
30     }
31     if(dp[la][lb])puts("true");else puts("false");
32 }

HJ72 百钱买百鸡问题

https://www.nowcoder.com/practice/74c493f094304ea2bda37d0dc40dc85b?tpId=37&tqId=21295&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3FtpId%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=

不是……???这个题目………………就直接让我打表啊?????

1 #include<bits/stdc++.h>
2 using namespace std;
3 int main(){
4     puts("0 25 75");
5     puts("4 18 78");
6     puts("8 11 81");
7     puts("12 4 84");
8 }

 HJ73 计算日期到天数转换

https://www.nowcoder.com/practice/769d45d455fe40b385ba32f97e7bcded?tpId=37&tqId=21296&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3Fpage%3D2%26tpId%3D37%26type%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 int days[12]={31,28,31,30,31,30,31,31,30,31,30,31};
 4 int main(){
 5     int y,m,d,sum=0;
 6     cin>>y>>m>>d;
 7     for(int i=1;i<m;i++){
 8         if(i!=2)sum+=days[i-1];
 9         else {
10             if((y%100&&y%4==0)||(y%100==0&&y%400==0))
11                 sum+=29;else sum+=28;
12         }
13     }
14     sum+=d;
15     cout<<sum;
16 }

 HJ74 参数解析

题目:https://www.nowcoder.com/practice/668603dc307e4ef4bb07bcd0615ea677?tpId=37&tqId=21297&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3FtpId%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=

用stringstream流处理数据,可以方便地提取里面的string> <

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 int main(){
 4     string s;
 5     getline(cin,s);
 6     stringstream v;
 7     v<<s;
 8     string w;
 9     int cnt=0;
10     while(v>>w){
11         if(w[0]!='\"')cnt++;
12         else{
13             if(w[w.size()-1]=='\"')cnt++;
14             else{
15                 while(v>>w){
16                     if(w[w.size()-1]=='\"')break;
17                 }
18                 cnt++;
19             }            
20         }
21     }
22     cout<<cnt<<endl;
23     v.clear();v<<s;
24     while(v>>w){
25         if(w[0]!='\"')cout<<w<<endl;
26         else {
27             if(w[w.size()-1]=='\"'){
28                 w.erase(0,1);
29                 w.erase(w.size()-1,1);
30                 cout<<w<<endl;
31             }
32             else{
33                 w.erase(0,1);
34                 cout<<w;
35                 while(v>>w){
36                     if(w[w.size()-1]!='\"')cout<<" "<<w;
37                     else {
38                         w.erase(w.size()-1,1);
39                         cout<<" "<<w<<endl;
40                         break;
41                     }
42                 }
43             }
44             
45         }
46     }
47 } 

 HJ75 公共子串计算

https://www.nowcoder.com/practice/98dc82c094e043ccb7e0570e5342dd1b?tpId=37&tqId=21298&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3FtpId%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 int main(){
 4     int ans=0;
 5     string s1,s2;
 6     cin>>s1>>s2;
 7     int l1=s1.size(),l2=s2.size();
 8     vector<vector<int>>dp(l1+1,vector<int>(l2+1));
 9     for(int i=0;i<l1;i++){
10         for(int j=0;j<l2;j++){
11             if(s1[i]==s2[j]){
12                 if(i-1>=0&&j-1>=0) dp[i][j]=dp[i-1][j-1]+1;
13                 else dp[i][j]=1;
14             }
15             else dp[i][j]=0;
16             ans=max(ans,dp[i][j]);
17         }
18     }
19     cout<<ans;
20 }

 HJ76 尼科彻斯定理

https://www.nowcoder.com/practice/dbace3a5b3c4480e86ee3277f3fe1e85?tpId=37&tqId=21299&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3FtpId%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 int main(){
 4     int m;cin>>m;
 5     int m_2=m*m;
 6     if(m_2%2){
 7         int fr=m_2,cnt=1,to_cnt=m/2;
 8         for(;cnt<=to_cnt;cnt++)
 9             fr-=2;
10         cnt=1;
11         for(;cnt<m;cnt++){
12             cout<<fr<<"+";
13             fr+=2;
14         }
15         cout<<fr;
16     }
17     else{
18         int fr=m_2-1,cnt=1,to_cnt=m/2;
19         for(;cnt<to_cnt;cnt++)
20             fr-=2;
21         cnt=1;
22         for(;cnt<m;cnt++){
23             cout<<fr<<"+";
24             fr+=2;
25         }
26         cout<<fr;
27     }
28 }

 HJ77 火车进站

https://www.nowcoder.com/practice/97ba57c35e9f4749826dc3befaeae109?tpId=37&tqId=21300&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3FtpId%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=

用字典序dfs出出站序列,然后用Check函数判断是否合法。如果不合法及时终止。

非法的序列满足:晚出现的排在前,但在它之后仍然存在符合进队序列次序的对子。

id记录各个号出现的位置。

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 int n,id[11];
 4 bool book[11];
 5 bool Check(int num,const vector<int>&a){
 6     if(num==0) return 1;
 7     for(int i=0;i<num;i++){
 8         int wz=id[a[i]];
 9         for(int j=i+1;j<num;j++){
10             for(int k=j+1;k<num;k++){
11                 if(id[a[k]]<wz&&id[a[j]]<id[a[k]])return 0;
12             }
13         }
14     }
15     return 1;
16 }
17 void dfs(int x,vector<int>&a){
18     if(!Check(x,a))return;
19     if(x==n){
20         for(auto i:a)cout<<i<<" ";
21         cout<<endl;
22         return;
23     }
24     for(int i=1;i<=n;i++){
25         if(book[i]==0){
26             book[i]=1;
27             a.push_back(i);
28             dfs(x+1,a);
29             a.pop_back();
30             book[i]=0;
31         }
32     }
33 }
34 int main(){
35     cin>>n;
36     int x;
37     for(int i=1;i<=n;i++){
38         cin>>x;
39         id[x]=i;
40     }
41     vector<int>a;
42     dfs(0,a);
43 }

 HJ80 整型数组合并

https://www.nowcoder.com/practice/c4f11ea2c886429faf91decfaf6a310b?tpId=37&tqId=21303&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=%2Fexam%2Foj%2Fta%3Fpage%3D2%26tpId%3D37%26type%3D37&difficulty=undefined&judgeStatus=undefined&tags=&title=

set基本操作

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 int main(){
 4     int n;
 5     cin>>n;
 6     set<int>st;
 7     int x;
 8     for(int i=1;i<=n;i++){
 9         cin>>x;
10         st.insert(x);
11     }
12     cin>>n;
13     for(int i=1;i<=n;i++){
14         cin>>x;
15         st.insert(x);
16     }
17     for(auto i:st)cout<<i;
18 }

by:AlenaNuna

posted on 2024-09-19 16:10  AlenaNuna  阅读(7)  评论(0编辑  收藏  举报