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perf: 1.c faster implementation of the leetcode TwoSum problem #902

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perf: 1.c faster implementation of the leetcode TwoSum problem #902

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perf: faster implementation of the TwoSum problem
straight-into-the-wall Oct 21, 2021
6453a9e
doc: fixed typos on comments
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80e54d9
updating DIRECTORY.md
Oct 21, 2021
23c0485
fix: comments on includes. Doxygen file. static test function
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Merge branch 'master' of github.com:TheAlgorithms/C
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fix: revert 1.c
straight-into-the-wall Oct 25, 2021
310c333
updating DIRECTORY.md
Oct 25, 2021
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Merge branch 'master' of github.com:TheAlgorithms/C into 1c
straight-into-the-wall Oct 25, 2021
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perf: faster implementation of the leetcode TwoSum problem
straight-into-the-wall Oct 25, 2021
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Merge branch 'TheAlgorithms:master' into master
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Merge remote-tracking branch 'upstream/master'
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Merge branch 'master' into 1c
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475c735
doc: better comment on two sum test function
straight-into-the-wall Nov 21, 2021
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doc: added comment on two sum test function
straight-into-the-wall Nov 21, 2021
16ee7ce
fix: added main and missing comments
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doc: add main comment
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70abeca
fix: file must ends with new line on leetcode/src/1.c
straight-into-the-wall Nov 22, 2021
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fix: invalid conversion from (void *) to (int *)
straight-into-the-wall Nov 22, 2021
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Update leetcode/src/1.c
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156 changes: 155 additions & 1 deletion leetcode/src/1.c
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Original file line number Diff line number Diff line change
@@ -1,7 +1,32 @@
/**
* @file
* @brief Implementation of the [Two
* sums](https://leetcode.com/problems/two-sum/) Leetcode problem
* @details
* A decent solution to the Two sum problem.
* @author [straight_into_the_wall](https://github.com/straight-into-the-wall)
*/

#include <assert.h> /// for assert
#include <stdint.h> /// for unsigned int with fixed size
#include <stdio.h> /// for IO operations
#include <stdlib.h> /// for malloc
#include <string.h> /// for string tools

/**
* @brief Given an array of integers nums and an integer target, return indices
* of the two numbers such that they add up to target.
*
* @param nums the array of integer in input.
* @param numsize the size of the array.
* @param target the integer target.
* @param returnsize the size of the returned array.
* @returns the converted new (malloced) string.
*/
int *twoSum(int *nums, int numsSize, int target, int *returnSize)
{
int i, j;
int *ret = calloc(2, sizeof(int));
int *ret = (int *) calloc(2, sizeof(int));
for (i = 0; i < numsSize; i++)
{
int key = target - nums[i];
Expand All @@ -15,3 +40,132 @@ int *twoSum(int *nums, int numsSize, int target, int *returnSize)
*returnSize = 2;
return ret;
}

/**
* @brief Two sum self-test implementation
* @returns void
*/
static void testTwoSum(int *nums, int numsSize, int target)
{
int retSize = 0;
int *ret = twoSum(nums, numsSize, target, &retSize);

for (int i = 0; i < retSize; i++) target -= nums[ret[i]];

free(ret);
assert(!target);
}

/**
* @brief Self-test implementations
* @returns void
*/
static void test(void)
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{
int nums[4] = {2, 7, 15, 11};
testTwoSum(nums, 4, 9);

int nums1[4] = {2, -7, 11, 15};
testTwoSum(nums1, 4, 4);

int nums2[3] = {3, 2, 4};
testTwoSum(nums2, 3, 6);

int nums3[2] = {3, 3};
testTwoSum(nums3, 2, 6);

int nums4[3] = {3, -3, 6};
testTwoSum(nums4, 3, 0);

int nums5[6] = {-13, 0, 13, 7, -3, 6};
testTwoSum(nums5, 6, -7);

int nums6[5] = {-1, -2, -3, -4, -5};
testTwoSum(nums6, 5, -8);

int nums7[] = {
1931729, 5896941, -56160, -5999108, -713650, 3135403, 870300,
-2938196, -726482, -152831, -5552046, -6857780, 2493109, -2409591,
7453630, 7848984, -806578, 4976647, -9199319, -7660981, 4168359,
5466164, 8577624, -7465790, -7808993, -7176396, -3622579, 4996177,
9623530, -1371773, -5633028, 5188756, 7971646, -2603602, 7490338,
3174208, -1825054, 6892503, -8201151, -1072749, -2746872, -718104,
-1804706, 5504856, -9104958, -2181797, 3151933, -6116343, 1436458,
-659793, -9256591, -3487143, 3396195, -6211129, -2789647, -9336842,
-122743, -3843085, 8515885, -8551842, -8668581, -5040156, -9626107,
-5645393, -5484621, -6417906, 4483313, -4197219, -5762688, -6645419,
1077632, 7237401, 4819732, 5220382, 8657346, 651862, 7406097,
6668849, 5067699, 4563307, -4358391, -3996666, -4298897, -9870277,
-628517, 1842975, -4970541, -8815324, -4174656, -9332000, 4647373,
9461387, -3504914, 2614670, -1315721, 6099266, -8562834, -4488116,
9742133, 307556, 791291, -2611787, 7656675, 9932436, -1905766,
5142745, 7210001, -4678645, 550797, 8462302, 6815722, -2985059,
-1236401, -6093644, -6617192, -9438320, 8400183, 8936598, 5378080,
9758788, 817106, 8613435, 3579880, -9100698, 993960, 5352546,
8481471, 3526666, 2961295, -7819498, 834324, 3435605, 9725655,
8490290, 7263645, -6863345, 2947003, -8152353, 5514173, -9865666,
343864, -6386758, -8675825, -3252881, 1149651, 6690889, 7528843,
-2861961, -4722247, -6985318, -9994086, 7192089, -4864512, 5773490,
-9492163, -2089496, 2246943, 430576, 3466065, 1578813, 2738295,
261493, -425120, 3666399, 8796329, 9220040, 7148637, 5956722,
9980401, 7834421, 2041136, 3763240, -831391, 7963736, 8744496,
9593751, 4606042, 66708, -6652782, -6619264, 2614784, 5655774,
-9547771, 2456855, 4268450, 864132, 4601358, -3464052, -8987625,
-4427713, -126397, -5823810, 8443040, -7428684, -4365060, -6392451,
-6258724, -9124302, -6566562, -4153846, -9120859, 7061892, -7707777,
9342864, -2133124, -7068189, -8657201, 2752682, -9943634, -8650517,
-5219095, 2305245, -1500154, 8915790, -2805210, 1860598, 3361037,
-8040669, 5809813, -2243400, -3418428, -1810675, -5203397, -7879177,
6898143, 7749161, -2810814, -7525359, -793458, 608571, -9383497,
9531109, 6862130, -3381989, 2332039, 6018975, -3350279, 7266303,
-7170480, -1127784, 578313, 6018329, 8822950, 4214273, -372530,
2706552, -4905224, 3324641, -5403812, 9319424, -2882974, -9228107,
6151855, 2634284, 7000575, 3215247, 5067619, 5076150, 1595871,
748735, -9225927, 1962290, 4653714, 697462, 2996679, -7562085,
-5387705, -912530, 1763635, -6139098, 2103001, -6316004, -3469182,
-3818553, 8854173, 422707, -3826706, -9777012, 7452324, 3665456,
-9458220, 4828502, 2641583, 5107388, -4201437, 5486625, -9315573,
1417427, -1838955, 9042987, -9704280, 7868946, -6737802, 4462332,
-5771637, 635858, 1438260, 8940144, 9385885, 3522022, -9736738,
-4387243, -8611088, 8733735, -2087884, 8299364, -1004025, 2674570,
4247204, 1972151, -2092476, -1318052, -796315, -6487458, 8714867,
-9966767, -5459861, -1286737, 9442201, -2065902, 2575270, 7184243,
5916475, -5728128, -3044939, 6372732, 4902791, 3474374, -7462481,
-9886552, -8361835, -5022392, -4583670, 3990789, -1051830, 8606314,
6365011, 6751820, 1727390, -2005234, -5845824, 9572998, 6867269,
4000416, 5629823, -2918551, 7278467, 9865305, 3781390, -1518411,
-7124219, 3800842, -4492377, -7479001, 4144917, 4639464, 7161451,
3391326, -2429792, 8240315, -8667371, 101661, -6049927, -9729041,
-2210443, -6907416, -1355534, 6292201, -1169114, -4565077, 3214740,
-6122903, 8326559, -3973709, 2313703, 9645383, 6119383, 8317176,
8177731, 7758979, 3037198, -9543017, -3436171, 3280360, -1444577,
-40402, -8372623, 6672469, 9125222, 6161730, 3783090, -2778572,
-8014616, -1588372, -3200391, 7126312, -5091311, -3637052, -6600914,
9034974, -6246289, -4974981, -9711741, -7867786, -9808240, 450272,
-3222991, -8251454, 3599528, -33487, -1114626, 8414308, -2607016,
1690025, 5981016, -2898849, -4650973, -8085619, -4875585, -2677275,
-7329644, -9730701, -5563788, 4635028, -4232606, 1863619, -9081061,
-8966306, 4907349, 348942, -6309867, 2436213, -6340842, 8276407,
-1112458, 4073087, 6632641, -6044509, -1714553, -9905887, 8140713,
-5566484, -8187046, -3636448, 560425, 9931445, -8142363, 1928694,
6652925, 5094575, 5525595, 9847315, 5323311, 9123454, 7425631,
2116547, 9033708, -2228326, 2858537, 5452249, -3388576, 8859366,
5965629, -9904937, 8961420, -8794807, 4363288, -1067547, 1903643,
-6637956, 3736544, 9150157, -3977433, 4333094, -1170635, -4933425,
5815702, 1846616, 793301, -9206787, -227043, -7076926, -461803,
-7477454, -1297664, 47425, 8506054, 8264895, -1199514, -4031592,
1245359, 2840097, 6948011};

testTwoSum(nums7, 492, 7828670);
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printf("All tests have successfully passed!\n");
}

/**
* @brief Main function
* @returns 0 on exit
*/
int main(void)
{
test(); // run self-test implementations
return 0;
}
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