问编码挑战: Kattis

EN

import sys

lines = sys.stdin.readlines()
lines = [x[:-1] for x in lines]
for line in lines:
    if len(line) > 1:
        line = line.split(':')
        found = False
        visited = {}
        curr = line[1].split()
        r = len(curr)
        for i in range(r):
            visited_2 = {}
            if curr[i] in visited:
                continue
            else:
                visited[curr[i]] = True
                for j in range(i+1, r):
                    if curr[j] in visited_2:
                        continue
                    else:
                        visited_2[curr[j]] = True
                        tmp = int(curr[i]) - int(curr[j])
                        for k in range(j+1, r):
                            if int(curr[j]) - int(curr[k]) == tmp:
                                print("no")
                                found = True
                                break
        if not found:
            print("yes")
    else:
        break