简单排序，但是由于读入量过大，要用getchar()按位读入数字。

#include 
      
        #include 
       
         #include 
        
          #include 
         
           #include 
          
            using namespace std; #define maxn 1000005 int n; int f[maxn]; int in() {
    char ch = '0'; int ret = 0; while (ch <= '9' && ch >= '0')     {
            ret = ret * 10 + ch - '0';         ch = getchar();     } return ret; } void input() {
        n = in(); for (int i = 0; i < n; i++)         f[i] = in(); } bool ok(int a, int b, int c) {
    return a > c - b; } bool work() {
    if (n <= 3) return false; if (ok(f[0], f[1], f[n - 1])) return false; for (int i = 0; i < n - 2; i++) if (ok(f[i], f[i + 1], f[i + 2])) return true; return false; } int main() {
    //freopen("t.txt", "r", stdin);     input();     sort(f, f + n); if (work())         printf("The set is accepted.\n"); else         printf("The set is rejected.\n"); return 0; }