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coordinate compression
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| def compress(arr): | |
| arr.sort(); | |
| compress_map = {} | |
| val = 1 | |
| for el in arr: | |
| if el not in compress_map: | |
| compress_map[el] = val | |
| val += 1 | |
| for i in range(len(arr)): | |
| arr[i] = compress_map[ arr[i] ] | |
| return (arr, compress_map) | |
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