UVa 1586

感觉这个题有个小坑。。。。如果是以数字结尾还需要计算一次
附上AC代码：

#include<bits/stdc++.h>
using namespace std;
const int maxn = 100;
int main()
{
	 int t;
	 char s[maxn];
 	scanf("%d", &t);
 	while(t--){
  	scanf("%s", s);
 	 int len = strlen(s);
  	double ans = 0, alpha = 0, digit = 0;
 	 for(int i = 0; i < len; i++){
   	  if(isalpha(s[i])){
    	 if(digit){
   	   ans += alpha * (digit - 1); 
   	  }
   	 if(s[i] == 'C'){
    	 alpha = 12.01;
 	   }else if(s[i] == 'H'){
  	   alpha = 1.008;
 	   }else if(s[i] == 'O'){
  	   alpha = 16.00;
  	  }else if(s[i] == 'N'){
    	 alpha = 14.01;
  	  }
 	   ans += alpha;
 	   digit = 0;
  	 }else if(isdigit(s[i])){
 	   {
  	   digit = 10 * digit + (s[i] - '0');
  	  }
	   }
 	 }
	  if(isdigit(s[len - 1])) ans += alpha * (digit - 1);
 	 printf("%.3f\n", ans);
 	}
	 return 0;
}