洛谷P1047校门外的树——Python简短写法

洛谷P1047校门外的树——Python简短写法

l, m = map(int, input().split(' '))
trees = [True]*(l+1)
for i in range(m):
    start, end = map(int, input().split(' '))
    trees[start:end+1] = [False]*(end+1-start)
print(sum(trees))

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