NOI题解(1.7编程基础之字符串)(待补全)

01:统计数字字符个数

#include "iostream"
#include "iomanip"
using namespace std;
int main()
{
    string str;
    getline(cin,str);
    int count=0;
    for(int i=0;i=48&&str.at(i)<=57)
        {
            count++;
//            cout<




02:找第一个只出现一次的字符

#include "iostream"
#include "iomanip"
using namespace std;
int main()
{
    string str;
    getline(cin,str);
    bool flag=false;
    int num[26]={0};
    for(int i=0;i

03:基因相关性

#include "iostream"
#include "iomanip"
using namespace std;
int main()
{
    double num;
    cin>>num;
    string str1,str2;
    cin>>str1>>str2;
    int count=0;
    for(int i=0;i=num)
        cout<<"yes";
    else
        cout<<"no";
    return 0;
}

04:石头剪子布

#include "iostream"
#include "iomanip"
using namespace std;
void cmpStr(string str1,string str2)
{
    if(str1=="Rock")
    {
        if(str2=="Rock")
            cout<<"Tie"<>N;
    string str1,str2;
    for(int i=0;i>str1>>str2;
        cmpStr(str1, str2);
    }
    return 0;
}

05:输出亲朋字符串

#include "iostream"
#include "string"
using namespace std;
int main()
{
    string s1,s2;
    getline(cin,s1);
    //注意：前面定义string类型的s2时是默认初始化，长度为0，所以这里我们指定s2的长度与s1一致
    s2.resize(s1.length(),'0');
    for(int i=0;i

06:合法 C 标识符

#include "iostream"
#include "string"
using namespace std;
bool isLegal(char c)
{
    if(c>='0'&&c<='9'||c=='_'||c>='a'&&c<='z'||c>='A'&&c<='Z')
    {
        return true;
    }
    return false;
}
bool isLegal2(char c)
{
    if(c=='_'||c>='a'&&c<='z'||c>='A'&&c<='Z')
    {
        return true;
    }
    return false;
}
int main()
{
    string str;
    getline(cin,str);
    bool legalF = true;
    for(int i=0;i

07:配对碱基链

#include "iostream"
#include "string"
using namespace std;
int main()
{
    string str;
    getline(cin,str);
    for(int i=0;i

08:字符替换

#include "iostream"
#include "string"
using namespace std;
int main()
{
    string str;
    char C,newC;
    cin>>str>>C>>newC;
    for(int i=0;i

09:密码翻译

#include "iostream"
#include "string"
using namespace std;
int main()
{
    string str;
    //注意：有空格的字符出输出用getline不要用cin
    getline(cin,str);
    for(int i=0;i='a'&&str[i]<='y')||(str[i]>='A'&&str[i]<='Y'))
        {
            str[i]=str[i]+1;
        }
        else if(str[i]=='z'||str[i]=='Z')
        {
            str[i] = str[i]-25;
        }
    }
    cout<

10:简单密码

#include "iostream"
#include "string"
using namespace std;
int main()
{
    string str;
    //注意：有空格的字符出输出用getline不要用cin
    getline(cin,str);
    for(int i=0;i'Z')
            continue;
        str[i] = (str[i]-'A'-5+26)%26+'A';
    }
    cout<

11:潜伏者

#include "iostream"
#include "string"
using namespace std;
char match[26];
int main()
{
    string before,after;
    cin>>after>>before;
    string text;
    cin>>text;
    //一个密文字符只能对应一个明文字符
    for(int i=0;i

12:加密的病历单

#include "iostream"
#include "string"
using namespace std;
int main()
{
    string str;
    cin>>str;
    //大小写反转
    for(int i=0;i='a'&&str[i]<='z')
        {
            //cout<='A'&&str[i]<='Z')
        {
            str[i]=str[i]+('a'-'A');
        }
    }
    //cout<='a'&&str[i]<='w')||(str[i]>='A'&&str[i]<='W'))
            str[i]=str[i]+3;
        else
            str[i]=str[i]-26+3;
    }
    cout<

13:将字符串中的小写字母转换成大写字母

#include "iostream"
#include "string"
using namespace std;
int main()
{
    string str;
    //可能包含空格
    getline(cin,str);
    //小写转大写
    for(int i=0;i='a'&&str[i]<='z')
        {
            //cout<

14:大小写字母互换

#include "iostream"
#include "string"
using namespace std;
int main()
{
    string str;
    getline(cin,str);
    //大小写互转
    for(int i=0;i='a'&&str[i]<='z')
        {
            //cout<='A'&&str[i]<='Z')
        {
            str[i]=str[i]+('a'-'A');
        }
    }
    cout<

15:整理药名

#include "iostream"
#include "string"
using namespace std;
int main()
{
    int n;
    cin>>n;
    for(int k=0;k>str;
        if (str[0] >= 'a' && str[0] <= 'z') {
            //cout<= 'A' && str[i] <= 'Z') {
                str[i] = str[i] + ('a' - 'A');
            }
        }
        cout<

16:忽略大小写的字符串比较

#include "iostream"
#include "string"
using namespace std;
char lower(char c1)
{
    if(c1>='A'&&c1<='Z')c1=c1+'a'-'A';
    return c1;
}
int main()
{
    string str1,str2;
    getline(cin,str1);
    getline(cin,str2);
    int maxLen = str1.length()>str2.length()?str1.length():str2.length();
    for(int i=0;i";
                }
                break;
            }
        } else {
            if (str1[i] == '\0' && str2[i] != '\0'){
                cout << "<";
                break;
            } else if (str1[i] != '\0' && str2[i] == '\0') {
                cout << ">";
                break;
            } else if (str1[i] == '\0' && str2[i] == '\0') {
                cout << "=";
                break;
            }
        }
    }

}

17:字符串判等

#include "iostream"
#include "string"
using namespace std;
char lower(char c1)
{
    if(c1>='A'&&c1<='Z')c1=c1+'a'-'A';
    return c1;
}
string dropBlank(string str)
{
    string temp;
    int blankNum = 0;
    for(int i=0;i

18:验证子串

#include "iostream"
#include "string"
using namespace std;
bool AisSubofB(string A,string B)
{
    int lenA = A.length();
    int indexA = 0;
    for(int i=0;i>str1>>str2;
    int len1 = str1.length();
    int len2 = str2.length();
    if(len1<=len2) {
        if (AisSubofB(str1, str2))
            cout << str1 << " is substring of " << str2;
        else
            cout << "No substring";
    }else
    {
        if(AisSubofB(str2,str1))
        {
            cout<

19:字符串移位包含问题

#include "iostream"
#include "string"
using namespace std;
bool AisSubofB(string A,string B)
{
    int lenA = A.length();
    int indexA = 0;
    for(int i=0;i>str1>>str2;
    int len1 = str1.length();
    int len2 = str2.length();
    if(len1<=len2) {
        for(int i=0;i

20:删除单词后缀

#include "iostream"
using namespace std;
int main()
{
    string word;
    cin>>word;
    int len = word.length();
    if(word[len-2]=='e'&&word[len-1]=='r')
        word.erase(word.length()-2,word.length()-1);
    else if(word[len-2]=='l'&&word[len-1]=='y')
        word.erase(word.length()-2,word.length()-1);
    else if(word[len-3]=='i'&&word[len-2]=='n'&&word[len-1]=='g')
        word.erase(word.length()-3,word.length()-1);
    cout<





21:单词替换

题目有问题，略过

22:紧急措施

#include "iostream"
using namespace std;
string changePwd(string str)
{
    for(int i=0;i='a'&&str[i]<='z')
        {
            str[i] = str[i]-('a'-'A');
        }else if(str[i]>='A'&&str[i]<='Z')
        {
            str[i] = str[i]+('a'-'A');
        }
    }
    return str;
}
int main()
{
    string email;
    cin>>email;
    int num;
    cin>>num;
    cin.ignore();
    bool flag = false;
    for(int i=0;i

23:过滤多余的空格

#include "iostream"
using namespace std;
int main()
{
    string str;
    getline(cin,str);
    int blankNum = 0;
    for(int i=0;i

24:单词的长度

#include "iostream"
using namespace std;
int main()
{
    string str;
    getline(cin,str);
    int index1 = 0,index2 = 0;
    //只有第一次输出时不输出逗号，设置第一次输出的标志位
    bool firstF = true;
    //从头到尾（包括\0结束符）检查字符串
    for(int i=0;i





25:最长最短单词

#include "iostream"
using namespace std;
int main()
{
    string str;
    getline(cin,str);
    string shortWord,longWord;
    int shortL=20000,longL = 0;
    int index1 = 0,index2 = 0;
    //从头到尾（包括\0结束符）检查字符串
    for(int i=0;i index2 - index1) {
                    shortWord = str.substr(index1, index2 - index1);
                    shortL = index2 - index1;
                }
                if (longL < index2 - index1) {
                    longWord = str.substr(index1, index2 - index1);
                    longL = index2 - index1;
                }
                //cout<