Preface Numbering chapter 2.2

题目总是看不懂,后来跑nocow上看翻译,虽然了解意思了,却被这几个规则搞的不知道从何下手,

想着数字到底怎么变成这些字母,后来一看nocow题解第一个...直接把个十百千位枚举然后组合到一起便可...突然感觉自己智商有点捉鸡→_→

  1 /*
  2 
  3 ID: hubiao cave
  4 
  5 PROG: preface
  6 
  7 LANG: C++
  8 
  9 */
 10 
 11 
 12 
 13 
 14 #include<iostream>
 15 
 16 #include<fstream>
 17 
 18 #include<string>
 19 
 20 using namespace std;
 21 
 22 
 23 string buf[4][10]={{"","I","II","III","IV","V","VI","VII","VIII","IX"},//个
 24     {"","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"},//十
 25     {"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"},//百
 26     {"","M","MM","MMM","","","","","",""}};
 27 
 28 
 29 int number;
 30 
 31 int cou[8];
 32 
 33 void work(string);
 34 int main()
 35 
 36 {
 37 
 38 
 39 
 40 
 41     ifstream fin("preface.in");
 42 
 43     ofstream fout("preface.out");
 44     fin>>number;
 45     for(int i=1;i<=number;i++)
 46     {
 47         int m=0;
 48         int t=i;
 49         while(t/10)
 50         {
 51             string str=buf[m][t%10];
 52             work(str);
 53             t/=10;
 54             m++;
 55         }
 56         string str=buf[m][t%10];
 57         work(str);
 58 
 59     }
 60 
 61     for(int i=1;i<=7;++i)
 62     {
 63         if(cou[i]==0)
 64             continue;
 65         switch(i)
 66         {
 67             case 1:
 68                 fout<<"I "<<cou[i]<<endl;
 69             break;
 70             case 2:
 71                 fout<<"V "<<cou[i]<<endl;
 72             break;
 73             case 3:
 74                 fout<<"X "<<cou[i]<<endl;
 75             break;
 76             case 4:
 77                 fout<<"L "<<cou[i]<<endl;
 78             break;
 79             case 5:
 80                 fout<<"C "<<cou[i]<<endl;
 81             break;
 82             case 6:
 83                 fout<<"D "<<cou[i]<<endl;
 84             break;
 85             case 7:
 86                 fout<<"M "<<cou[i]<<endl;
 87             break;
 88         }
 89     }
 90     
 91     
 92 
 93     return 0;
 94 
 95 
 96 }
 97 
 98 void work(string str)
 99 {
100     for(int i=0;i<str.length();i++)
101     {
102         switch(str[i])
103         {
104             case 'I':
105                 cou[1]++;
106             break;
107             
108             case 'V':
109                 cou[2]++;
110             break;
111 
112             case 'X':
113                 cou[3]++;
114             break;
115 
116             case 'L':
117                 cou[4]++;
118             break;
119 
120             case 'C':
121                 cou[5]++;
122             break;
123 
124             case 'D':
125                 cou[6]++;
126             break;
127 
128             case 'M':
129                 cou[7]++;
130             break;
131         }
132     }
133 }

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原文地址：https://www.cnblogs.com/cavehubiao/p/3283979.html