SUMFOUR - 4 values whose sum is 0
The SUM problem can be formulated as follows: given four lists A, B, C, D of integer values, compute how many quadruplet (a, b, c, d ) belongs to A x B x C x D are such that a + b + c + d = 0 . In the following, we assume that all lists have the same size n
Input
The first line of the input file contains the size of the lists n (this value can be as large as 4000). We then have n lines containing four integer values (with absolute value as large as 228 ) that belong respectively to A, B, C and D .
(Edited: n <= 2500)
Output
Output should be printed on a single line.
Example
Input: 6 -45 22 42 -16 -41 -27 56 30 -36 53 -37 77 -36 30 -75 -46 26 -38 -10 62 -32 -54 -6 45 Output: 5
hide comments
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wille_25:
2020-08-01 05:41:36
if you do ABCDEF problem first ...its is a piece of cake for you ...same logic; |
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overthinker_72:
2020-06-07 12:58:36
upper bound and lower bound can help :)
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shivamojha99:
2020-06-04 14:20:26
Can anyone tell me why map.find() isn't working although its complexity is log(n) too, and why using vectors get AC but not with Map function??
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sandeep48:
2020-06-04 07:30:55
(n square)log(n) is working |
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brokeboy:
2020-05-04 13:35:26
STL maps gave TLE. Use array and sort instead. |
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kkkrr:
2020-04-21 23:12:31
It can be solved using hashing. Instead of using STL try implementing your own hash map:) |
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manish_thakur:
2020-04-01 16:01:14
Since you have come to comments for help, use equal_range in c++ |
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d_sm:
2020-03-09 07:36:55
accepted in one submission , make lhs and rhs two array and then sort ,and search for each lhs the upper and lower bound in rhs..... |
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fardin_abir:
2020-02-27 19:30:05
holding the meet in the middle concept, first tried with unordered map but got TLE, then tried with two pointers and got AC |
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bhavikag:
2020-01-31 12:39:10
Has anybody done this in java?
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| Added by: | Abhilash I |
| Date: | 2007-02-06 |
| Time limit: | 1.419s |
| Source limit: | 50000B |
| Memory limit: | 1536MB |
| Cluster: | Cube (Intel G860) |
| Languages: | All except: ERL JS-RHINO NODEJS PERL6 VB.NET |
| Resource: | South western 05-06 |
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