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一维差分小总结
阅读量:369 次
发布时间:2019-03-04

本文共 1480 字,大约阅读时间需要 4 分钟。

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    def main():    import sys    input = sys.stdin.read    data = input().split()    idx = 0    n = int(data[idx])    idx += 1    m = int(data[idx])    idx += 1        queries = []    for _ in range(m):        l = int(data[idx])        idx += 1        r = int(data[idx])        idx += 1        queries.append((l, r))        diff = [0] * (n + 2)    for l, r in queries:        diff[l] += 1        if r + 1 <= n:            diff[r + 1] -= 1        freq = [0] * (n + 1)    for i in range(1, n + 1):        freq[i] = diff[i]        freq.sort(reverse=True)        a = [0] * (n + 1)    current = n    for i in range(1, n + 1):        if freq[i] == 0:            a[i] = 0        else:            a[i] = current            current -= 1        pre = [0] * (n + 1)    for i in range(1, n + 1):        pre[i] = pre[i - 1] + a[i]        total = 0    for l, r in queries:        total += pre[r] - pre[l - 1]        print(total)if __name__ == "__main__":    main()

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