Blue Bridge Cup study 2022.7.5 (morning)

String part ：

#include<iostream>
#include<string>
using namespace std;

int main()
{	
	int n;
	cin>>n;

	for(int i=1;i<=n;i++)
	{
		string space = string(n-i,' ');
        // Space 
		string ch = string(2*i-1,'A'+i-1);
		// character 
        cout<<space+ch<<endl;
	}
	return 0;
}
 

#include<iostream>
using namespace std;

int main()
{
	char c;
	cin>>c;
 // The input is a number (1 To 9) Or letters (A To Z)
	if(c>='A'&&c<='Z')
	{
		for(int i=1;i<=c-'A'+1;i++)
        // Control the number of lines 
		{
			for(int j=1;j<=c-'A'+1-i;j++)
			{
				cout<< " ";
			}
        // The output order of letters is to increase first and then decrease 
			for(int j=1;j<=i;j++)
			{
				cout<<(char)('A'+j-1);
			}
			for(int j=i-1;j>=1;j--)
			{
				cout<<(char)('A'+j-1);
			}
			cout<<endl;
		}
	}
	else
	{
		for(int i=1;i<=c-'1'+1;i++)
		{
			for(int j=1;j<=c-'1'+1-i;j++)
			{
				cout<< " ";
			}
			for(int j=1;j<=i;j++)
			{
				cout<<(char)('1'+j-1);
			}
			for(int j=i-1;j>=1;j--)
			{
				cout<<(char)('1'+j-1);
			}
			cout<<endl;
		}
	}
	return 0;
}

// Symmetric strings 
#include<stdio.h>
#include<string.h>
char res[5000000];
int main()
{
	int n;
	scanf("%d",&n);
	int len=0;
	for(int i=1;i<=n;i++)
//0  To  len-1
	{
// stay len There is a space here 
		strcat(res+len+1 ,res);
		res[len]='A'+i-1;
		len=strlen(res);
	}
	printf("%s\n",res);
	return 0;
}
//A
//ABA
//ABACABA
//ABACABADABACABA

#include<cstdio>
#include<cstring>
char s1[1005],s2[1005];
int main()
{
	fgets(s1,1004,stdin);
	fgets(s2,1004,stdin);
    //fgets The length of the newline will be added at the end  
	int len1 = strlen(s1)-1,len2 = strlen(s2)-1;
    // You need to subtract the length of the newline 
	int ans = 0;
	for(int i=0;i+len2-1<len1;i++)
	{
		bool matched = true;
		for(int j=0;j<len2;j++)
		{
			if(s1[i+j]!=s2[j])
			{
				matched=false;
				break;
			}
		}
		if(matched)
		{
			ans++;
		}
	}
	printf("%d\n",ans);
	return 0;
}