学步园

http://acm.hdu.edu.cn/showproblem.php?pid=2537

//水题
#include <string>
#include <iostream>

using namespace std;

int main()
{
 int rsum, ysum, n;
 int i;
 string str;
 while (cin >> n && n) {
  cin >> str;
  rsum = ysum = 0;
  for (i = 0; i < str.length()-1; i++) {
   if (str[i] == 'R') rsum ++;
   if (str[i] == 'Y') ysum ++; 
  }
  if (str[i] == 'B' && rsum != 7) puts("Yellow");
  if (str[i] == 'B' && rsum == 7) puts("Red");
  if (str[i] == 'L' && ysum != 7) puts("Red");
  if (str[i] == 'L' && ysum == 7) puts("Yellow");
 }
 return 0;
}