test

数字颠倒 字符反转

#include "stdio.h"
int main(void)
{
    int num;
    scanf("%d",&num);
    while(num)
    {
        printf("%d",num%10);
        num /= 10;
    }
    return 0;
}
字符反转
#include <iostream>
#include <string>
using namespace std;
int main(){
    string str;
    cin >> str;
    for(int i = str.size()-1; i >=0;i--)
        cout << str[i];
}

int 转2进制1的个数

#include<iostream>
using namespace std;
int main()
{
    int n,ans=0;
    cin>>n;
    while(n>0)
    {
        ans+=(n%2);
        n/=2;
    }
    cout<<ans;
    return 0;
}

单词长度 句子逆序 数字颠倒

单词长度
package main
import (
    "bufio"
    "fmt"
    "os"
    "strings"
)
 
func main() {
    reader := bufio.NewReader(os.Stdin)
    result, err := reader.ReadString('\n')
    if err != nil {
        fmt.Println("read error:", err)
    }
    strArr := strings.Split(result, " ")
    w := strArr[len(strArr)-1]
    fmt.Printf("%d", len(w) - 1)
}

句子逆序
func ReverseWords()  {
    //myl:=list.New()
    var str string
    inputReader:=bufio.NewReader(os.Stdin)
    str,err:=inputReader.ReadString('\n')
    if err != nil {
        fmt.Println(err)
    }
 
    end:=len(str)
    str=str[:end-1]
    res:=strings.Split(str," ")
 
    for i := len(res) - 1; i > 0; i-- {
        fmt.Printf("%s ",res[i])
    }
    fmt.Printf("%s",res[0])
    //fmt.Printf("res is %v,len is %v\n",res,len(res))
}

数字颠倒
#include<iostream>
#include<algorithm>
using namespace std;
 
int main(){   
    int n;
    cin>>n;
    string str = to_string(n);
    reverse(str.begin(), str.end());
    cout<<str;
    return 0;
}

计算字符个数

a=input().lower()
b=input().lower()
print(a.count(b))

随机数去重排序

#include<iostream>
#include<set>
using namespace std;
int main()
{
    int N,n;
    set<int> ss;
    while(cin>>N)     //多组数据
    {
        ss.clear();   //清除上一组数据的影响
     while(N--)
     {
         cin>>n;
         ss.insert(n);
     }
     for (set<int>::iterator it = ss.begin(); it != ss.end(); it++)
     {
            cout << *it << endl;
     }    
    }
    return 0;
}

字符串隔8分

#include <iostream>
#include <string>
using namespace std;
void ***(string str) {
    if (str == "")
        return;
    if (str.size() <= 8) {
        str.append(8 - str.size(), '0');
        cout << str << endl;
        return;
    }
    cout << str.substr(0, 8) << endl;
    sub(str.substr(8, str.size()));
}
int main() {
    string str1, str2;
    cin >> str1 >> str2;
    sub(str1);
    sub(str2);
    return 0;
}

进制转换

#include <stdio.h>
int main(){
    int a;
    while (scanf("%x", &a) != EOF){
        printf("%d\n", a);
    }
    return 0;
}

四舍五入

#include <iostream>
using namespace std;
int main()
{
float a;
cin>>a;
cout<<int(a+0.5);
return 0;
} 

字符串排序

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
 
using namespace std;
 
int main()
{
    int input;
    while (cin >> input)
    {
        string str;
        vector<string> vs;
        while (input--)
        {
            cin >> str;
            vs.push_back(str);
        }
        sort(vs.begin(), vs.end());
        vector<string>::iterator vit;
        for (vit = vs.begin(); vit != vs.end(); vit++)
        {
            cout << *vit << endl;
        }
    }
 
    return 0;