[백준] 2669. 직사각형 네개의 합집합의 면적 구하기

pan = [[0 for _ in range(101)] for _ in range(101)]
for _ in range(4):
    nlst = list(map(int,input().split()))
 
    for i in range(nlst[0],nlst[2]):
        for j in range(nlst[1],nlst[3]):
            pan[i][j]=1
 
result = 0
for i in pan:
    result = result + sum(i)
 
print(result)