输入输出优化（来自LG)

    #include<iostream>      #include<cstdio>      using namespace std;      void read(int &x){          x=0;char c=getchar();          while(c<'0' || c>'9')c=getchar();          while(c>='0' && c<='9'){              x=x*10+c-'0';              c=getchar();          }       }      void write(int x){          int y=10,len=1;          while(y<=x)  {y*=10;len++;}          while(len--){y/=10;putchar(x/y+48);x%=y;}      }      int main(){          freopen("tt.in","r",stdin);          freopen("tt.out","w",stdout);          int i,j,k,m,n;            //for(i=1;i<=10000000;i++){read(n);printf("%d ",n);}          for(i=1;i<=10000000;i++){read(n);write(n);putchar(' ');}          return 0;      }