Processing math: 100%

USACO 2024 US Open Contest, Gold

Problem 2. Grass Segments


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Bessie is planting some grass on the positive real line. She has N (2N2105) different cultivars of grass, and will plant the ith cultivar on the interval [i,ri] (0<i<ri109).

In addition, cultivar i grows better when there is some cultivar j (ji) such that cultivar j and cultivar i overlap with length at least ki (0<kirii). Bessie wants to evaluate all of her cultivars. For each i, compute the number of ji such that j and i overlap with length at least ki.

INPUT FORMAT (input arrives from the terminal / stdin):

The first line contains N.

The next N lines each contain three space-separated integers i, ri, and ki.

OUTPUT FORMAT (print output to the terminal / stdout):

The answers for all cultivars on separate lines.

SAMPLE INPUT:

2
3 6 3
4 7 2

SAMPLE OUTPUT:

0
1

The overlaps of the cultivars is [4,6], which has length 2, which is at least 2 but not at least 3.

SAMPLE INPUT:

4
3 6 1
2 5 1
4 10 1
1 4 1

SAMPLE OUTPUT:

3
3
2
2

SAMPLE INPUT:

5
8 10 2
4 9 2
3 7 4
5 7 1
2 7 1

SAMPLE OUTPUT:

0
3
1
3
3

SCORING:

  • Input 4-5: N5000
  • Inputs 6-11: k is the same for all intervals
  • Inputs 12-20: No additional constraints.

In addition, for Inputs 5, 7, ..., 19, ri2N for all i.

Problem credits: Benjamin Qi

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