hiho一下第107周《Give My Text Back》

题目链接:传送门

题目大意:给你多组格式不标准的字符串句子，要你恢复到标准格式(单词中间只有一个空格或者一个逗号一个空格，句子的首字母大写其他小写，遇到回车也要换行)

题目思路:直接按题意模拟，注意几个标记变量的状态改变就行

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <cstring>
#include <stack>
#include <cctype>
#include <queue>
#include <string>
#include <vector>
#include<functional>
#include <set>
#include <map>
#include <climits>
#define lson root<<1,l,mid
#define rson root<<1|1,mid+1,r
#define fi first
#define se second
#define ping(x,y) ((x-y)*(x-y))
#define mst(x,y) memset(x,y,sizeof(x))
#define mcp(x,y) memcpy(x,y,sizeof(y))
using namespace std;
#define gamma 0.5772156649015328606065120
#define MOD 1000000007
#define inf 0x3f3f3f3f
#define N 30005
#define maxn 100005
typedef pair<int,int> PII;
typedef long long LL;

char ch;
string st="";

int main(){
int i,j,x,y;
int dax=1,kong=0;
while(cin>>noskipws>>ch){
if(isalpha(ch)){
ch=tolower(ch);
if(dax){
if(kong)st+=" ";
st+=toupper(ch);
dax=0;
}
else{
st+=ch;
}
kong=1;
}
else{
if(ch==','){
if(st[st.length()-1]==' ')st[st.length()-1]=',';
else st+=',';
st+=" ";
kong=0;
}
else if(ch=='.'){
if(st[st.length()-1]==' ')st[st.length()-1]='.';
else st+='.';
kong=1;
dax=1;
}
else if(ch==' '||ch=='\t'){
if(kong){
st+=" ";
kong=0;
}
}
else if(ch=='\n'){
if(st!=""){
int len=st.length();
for(i=len-1;i>=0;--i)if(st[i]!=' ')break;
st=st.substr(0,i+1);
cout<<st<<endl;
dax=1;kong=0;
st="";
}
}
}
}
return 0;
}