제출 #1100562

#제출 시각아이디문제언어결과실행 시간메모리
1100562vjudge1별들과 삼각형 (IZhO11_triangle)Pypy 2
0 / 100
26 ms19760 KiB
from collections import defaultdict
n = int(input())
stars = []
for _ in range(n):
    x, y = map(int, input().split())
    stars.append((x, y))
xc = defaultdict(int)
yc = defaultdict(int)
for x, y in stars:
    xc[x] += 1
    yc[y] += 1
total_triangles = 0
mp = defaultdict(int)
for x, y in stars:
    mp[(x, y)] += 1
for x, y in stars:
    x_leg = xc[x] - mp[(x, y)]
    y_leg = yc[y] - mp[(x, y)]
    total_triangles += x_leg * y_leg
print(total_triangles)
#결과 실행 시간메모리채점기 출력
결과를 불러오는 중입니다…