codeforces 538 A.Cutting Banner

A. Cutting Banner
time limit per test
2 seconds
memory limit per test
256 megabytes
input
standard input
output
standard output
A large banner with word CODEFORCES was ordered for the 1000-th onsite round of Codeforcesω that takes place on the Miami beach. Unfortunately, the company that made the banner mixed up two orders and delivered somebody else's banner that contains someone else's word. The word on the banner consists only of upper-case English letters.
There is very little time to correct the mistake. All that we can manage to do is to cut out some substring from the banner, i.e. several consecutive letters. After that all the resulting parts of the banner will be glued into a single piece (if the beginning or the end of the original banner was cut out, only one part remains); it is not allowed change the relative order of parts of the banner (i.e. after a substring is cut, several first and last letters are left, it is allowed only to glue the last letters to the right of the first letters). Thus, for example, for example, you can cut a substring out from string 'TEMPLATE' and get string 'TEMPLE' (if you cut out string AT), 'PLATE' (if you cut outTEM), 'T' (if you cut out EMPLATE), etc.
Help the organizers of the round determine whether it is possible to cut out of the banner some substring in such a way that the remaining parts formed word CODEFORCES.
Input
The single line of the input contains the word written on the banner. The word only consists of upper-case English letters. The word is non-empty and its length doesn't exceed 100 characters. It is guaranteed that the word isn't word CODEFORCES.
Output
Print 'YES', if there exists a way to cut out the substring, and 'NO' otherwise (without the quotes).
Sample test(s)
input

CODEWAITFORITFORCES

output

YES

input

BOTTOMCODER

output

NO

input

DECODEFORCES

output

YES

input

DOGEFORCES

output

NO

제목 링크:http://codeforces.com/contest/538/problem/A
제목 대의: 문자열을 주고 다음 단락을 자른 후 나머지 부분은 "CODEFORCES"와 같은지 확인하고, "YES"를 출력할 수 있으며, "NO"를 출력할 수 없습니다.흔히 볼 수 있는 문자열 처리 문제입니다.substr () 함수로 처리하면 됩니다.
코드는 다음과 같습니다.

#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
using namespace std;
int main()
{
	int n,p=0;
	string a;
	cin>>a;
	n=a.length();
	for(int i=0;i<n;i++)
	{
		for(int len1=1;len1<n-i+1;len1++)
		{
			string b=a.substr(i,len1);//b       ，c       
			for(int j=i+len1;j<n;j++)
			{
				for(int len2=1;len2<n-j+1;len2++)
				{
					string c=a.substr(j,len2);
					if(b+c=="CODEFORCES"&&(i==0&&j+len2==10||j+len2==n&&i==n-10||i==0&&j+len2==n))
					{//        ，                         
						p=1; 
						printf("YES
");
						break;
					}
				}
				if(p)
					break;
			}
			if(p)break;
		}
		if(p)break;
	}
	if(!p)
		printf("NO
");
	return 0;
}