Problem
Given N intervals [L1, R1], ..., [Ln, Rn], merge all overlapping intervals and print them in increasing order.
Input format
Input
input.txt
- The first line contains N (1 ≤ N ≤ 100). - Each of the next N lines contains two integers Li, Ri (Li ≤ Ri, -1000 ≤ Li, Ri ≤ 1000).
Output format
Output
output.txt
- The merged intervals, each on one line: "L R".
Example
input
3 1 4 2 6 8 10
output
1 6 8 10
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Sample cases (from the problem)
Sample Case 1
Input
3 1 4 2 6 8 10
Expected output
1 6 8 10
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