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34 | 34 | | Tree Data Structure in Python | [general_tree_structure.py](https://github.com/devAmoghS/Python-Interview-Problems-for-Practice/blob/master/general_tree_structure.py) | |
35 | 35 | | Given the arrival and departure times of all trains that reach a railway station, the task is to find the minimum number of platforms required for the railway station so that no train waits. |
36 | 36 | We are given two arrays that represent the arrival and departure times of trains that stop. | [getMinPlatforms.py](https://github.com/devAmoghS/Python-Interview-Problems-for-Practice/blob/master/getMinPlatforms.py) | |
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| 37 | +| Print duplicate characters in a string | [get_dup_chars.py](https://github.com/devAmoghS/Python-Interview-Problems-for-Practice/blob/master/get_dup_chars.py) | |
| 38 | +| Check if a given array has zero sum sub array | [hasZeroSumSubArray.py](https://github.com/devAmoghS/Python-Interview-Problems-for-Practice/blob/master/hasZeroSumSubArray.py) | |
| 39 | +| Given a string, check if it only contains digits | [has_only_digits.py](https://github.com/devAmoghS/Python-Interview-Problems-for-Practice/blob/master/has_only_digits.py) | |
| 40 | +| Given two lat, long coordinates , calculate `Haversine` distance between them | [haversine.py](https://github.com/devAmoghS/Python-Interview-Problems-for-Practice/blob/master/haversine.py) | |
| 41 | +| Heap Data Structure | [heap_structure.py](https://github.com/devAmoghS/Python-Interview-Problems-for-Practice/blob/master/heap_structure.py) | |
| 42 | +| Print numbers 1 to 100 without using any numbers or integers | [hundred_without_int.py](https://github.com/devAmoghS/Python-Interview-Problems-for-Practice/blob/master/hundred_without_int.py) | |
| 43 | +| Write a program to convert interger to Roman Representation | [interger_to_roman_num.py](https://github.com/devAmoghS/Python-Interview-Problems-for-Practice/blob/master/interger_to_roman_num.py) | |
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