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PERMTGEN - Permutation Generator |
Hasan Jaddouh has invented a new algorithm for generating permutations this algorithm takes an array with length N as input and generate a permutation with length N from this array.
The array must satisfy (1 <= Ai <= i) in order for the resulting array to be a permutation. Here is the pseudo code of the algorithm:
read N for i=1 to N do read A[i] for i=1 to N do for j=1 to i-1 do if A[j] >= A[i] do A[j] = A[j]+1 for i=1 to N do print A[i]
but unfortunately for Hasan Jaddouh, his algorithm is too slow for big arrays so he asked you to help him to find a fast way to implement his algorithm.
your program should read input same as the pseudo code and output the new array.
Input
first line contains integer N (1 <= N <= 105).
second line contains N integers separated by spaces each integer is between 1 and 109 inclusive.
Note: in order for Hasan Jaddouh's algorithm to work and generate a permutation the constraint (1 <= Ai <= i) must be satisfied but to make this problem harder this constraint is not guaranteed so it's also not necessary that the output is a permutation.
Output
Output N integers separated by spaces, the new array after applying Hasan Jaddouh's algorithm.
Example
Input: 4 4 2 1 3 Output: 7 4 1 3
Added by: | Hasan Jaddouh |
Date: | 2013-05-06 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
Resource: | own problem |
hide comments
2023-07-29 20:09:13 Oleg
Solution from https://www.spoj.com/problems/KHAOTMPL accepted without any changes. Last edit: 2023-07-29 20:10:33 |
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2013-05-13 03:09:15 Pushkar Mishra
Finally got the bug. My algorithm becomes n^2 for the worst case when all elements of the actual array are 1. Thank you. Last edit: 2013-05-13 03:19:00 |
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2013-05-12 17:44:33 Pushkar Mishra
I am pretty sure my algorithm is nlogn for all inputs. How can I make output faster? Thank you. RE: it's not a matter of fast input/output method it's a matter of fast algorithm, try this test case on your PC and see how much time your code takes: 100000 1 1 1 1 .... 1 1 1 1 Last edit: 2013-05-12 17:54:19 |
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2013-05-12 15:19:30 Pushkar Mishra
@Author: It is a great question. I have almost got it correct. Can you please provide some tricky test cases. It will be of great help. you can email me as well: pushkar72@hotmail.com Thank you. RE: your code outputs strange characters, your problem is inside function "tostr" By the way, after you fix your function tostr your code still TLE , are you sure you code guarantee O(log(n)) worst-case for each number? my code O(N log N) worst-case and its total running time is 0.5s for all test cases Last edit: 2013-05-12 17:14:13 |
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2013-05-12 08:27:09 Pushkar Mishra
My program gives SIGSEGV error. My code runs fine on my machine and on several online compilers. Please check. Submission ID: 9246288 Thank you. RE: try to run you code on MS C++ compiler, it will give you Runtime error. or you can see your code here -deleted- got Runtime error Last edit: 2013-05-12 16:28:17 |
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2013-05-11 14:34:07 Pushkar Mishra
Time limit is too strict for python and java. RE: good algorithm + fast IO method = AC even for slow languages Last edit: 2013-05-11 19:26:32 |