2019福建省赛—Complier（简单字符串处理）

Complier

时间限制: 1 Sec  内存限制: 128 MB

题目描述

HIT_TOM gets high score in the course《Compiling Principle》. So He wants to examine your knowledge of compilation principles.
He will give you some code fragment, you need to remove the comments from it.
There are two cases of comments:
1.  Start with /* and end with */
2.  start with //, extending to the end of the line
No characters are allowed to be deleted except for comments.

 

输入

A code fragment with several lines.
It is guaranteed that the number of characters is not exceeding 1000 for each  line. 
It is guaranteed that the total number of characters is not exceeding 100000.

 

输出

For each test case, you need to print all characters of the code except the comments.

样例输入

int main() {
    return 0; // this is a comment
}

样例输出

int main() {
    return 0;
}

提示

It is guaranteed that all characters are English characters. And to simplify the question, we ensure quotation marks( ‘ and “ ) will not appear.
It is guaranteed that the test cases given can be complied by g++. 
If you are confused with some situation, you can write you comments on your IDE(maybe codeblocks) to know what you should output.

虽然是道水题，可是自己还是写了好久，可能是我太菜了，写个博客记录一下吧

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int maxn=1e5+7;
char str[maxn];
int main()
{
    ll x=1;
    /*x*/x*=x;/*x*/x*=x;/*x*/x*=x;/*x*/x*=x;/*x*/x*=x;/*x*/x*=x;/*x*/x=8*2;/*x*/
    /*123/*//*/**/
    /*123/*//*/*123*/
    /*123/*//*123/*123*/
    /*123/*123//*123/*123*/

    /*
    int main() {
        return 0; // this is a comment
    }
    */
    //样例测试用

    int flag=0;
    while(gets(str))
    {
        int len=strlen(str);
        int i=0;
        while(i<len)
        {
            if(flag==0&&i<len-1&&str[i]=='/'&&str[i+1]=='/')
            {
                str[i]='1',str[i+1]='1';
                flag=1;
                i+=2;
            }
            if(flag==0&&i<len-1&&str[i]=='/'&&str[i+1]=='*')
            {
                str[i]='1',str[i+1]='1';
                flag=2;
                i+=2;
            }
            if(i<=len-1&&flag==0)putchar(str[i]),++i;
            if(flag==2&&i<len-1&&str[i]=='*'&&str[i+1]=='/')
            {
                str[i]='1',str[i+1]='1';
                flag=0;
                i+=2;
            }
            if(flag!=0)++i;
        }
        if(flag==1||flag==0)
        {
            flag=0;
            puts("");
        }
    }
    return 0;
}