UVa272 - TEX Quotes

Time limit: 3.000 seconds

怎么说呢……挺难受的，前不久学校ACM集训队选拔，惨败，垫底，没什么借口好说，就是突然觉得自己好无力……也练了一阵了，没想到会这样。实验室不愿意去了，学校里用来挂题的vjudge……不想去了，反正我现在也不属于那里了，换了UVa，全英文界面，还反应特别慢，其实不怎么喜欢它。开始从头练习，发现自己其实确实挺多问题的，很多东西本来就没夯实，有很多还忘了。

TEX is a typesetting language developed by Donald Knuth. It takes source text together with a few
typesetting instructions and produces, one hopes, a beautiful document. Beautiful documents use “
and ” to delimit quotations, rather than the mundane ” which is what is provided by most keyboards.
Keyboards typically do not have an oriented double-quote, but they do have a left-single-quote and a right-single-quote '. Check your keyboard now to locate the left-single-quote key (sometimes
called the “backquote key”) and the right-single-quote key ’ (sometimes called the “apostrophe” or
just “quote”). Be careful not to confuse the left-single-quote with the “backslash” key \. TEX lets the user type two left-single-quotes `` to create a left-double-quote “ and two right-single-quotes '' to create a right-double-quote ”. Most typists, however, are accustomed to delimiting their quotations with the un-oriented double-quote ". If the source contained "To be or not to be," quoth the bard, "that is the question." then the typeset document produced by TEX would not contain the desired form: “To be or not to be,” quoth the bard, “that is the question.” In order to produce the desired form, the source file must contain the sequence: ``To be or not to be,'' quoth the bard, ``that is the question.'' You are to write a program which converts text containing double-quote (") characters into text that is identical except that double-quotes have been replaced by the two-character sequences required by TEX for delimiting quotations with oriented double-quotes. The double-quote (") characters should be replaced appropriately by either `` if the " opens a quotation and by '' if the " closes a quotation. Notice that the question of nested quotations does not arise: The first " must be replaced by ``, the next by '', the next by ``, the next by '', the next by ``, the next by '', and so on. Input Input will consist of several lines of text containing an even number of double-quote (") characters. Input is ended with an end-of-file character. Output The text must be output exactly as it was input except that: • the first " in each pair is replaced by two characters: and • the second " in each pair is replaced by two ' characters: ''. Sample Input "To be or not to be," quoth the Bard, "that is the question". The programming contestant replied: "I must disagree. To `C' or not to `C', that is The Question!" Sample OutputTo be or not to be,” quoth the Bard, that is the question''. The programming contestant replied:I must disagree.
To C' or not toC’, that is The Question!”
――全剧终――

代码块

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<queue>
#include<stack>
#include<vector>
#include<cmath>
#include<string.h>
#define maxn 1010
#define ll long long
#define INF 0x3f3f3f3f3f3f3f3f
using namespace std;
int a[maxn];
int main()
{
//  freopen("output.txt","w",stdout);
    char c;
    int i,j,flag;
    i=flag=0;
    while((c=getchar())!=EOF){
        if(c=='"'){
            if(flag==0){
                printf("``");
                flag=1;
            }
            else{
                printf("''");
                flag=0;
            }
        }
        else{
            printf("%c",c);
        }
    }
    return 0;
}