int

int Scan(){    int res = 0, ch, flag = 0;    if((ch = getchar()) == '-')             //判断正负        flag = 1;    else if(ch >= '0' && ch <= '9')           //得到完整的数        res = ch - '0';    while((ch = getchar()) >= '0' && ch <= '9' )        res = res * 10 + ch - '0';    return flag ? -res : res;}

double

int re(double *ret) {      int sgn;      double bit=0.1;      char c;      c=getchar();      if(c==EOF)return true;      while(c!='-'&&c!='.'&&(c<'0'||c>'9'))c=getchar();      sgn=(c=='-')?-1:1;      *ret=(c=='-')?0:(c-'0');      while((c=getchar())>='0'&&c<='9')*ret=*ret*10+(c-'0');      if(c==' '||c=='\n'){*ret*=sgn;return true;}      while((c=getchar())>='0'&&c<='9')*ret+=(c-'0')*bit,bit/=10;      *ret*=sgn;      return false;  }

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