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0015-threeSum.go
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package main
import (
"fmt"
"sort"
)
func threeSum(nums []int) [][]int {
l := len(nums)
if l < 3 {
return nil
}
sort.Ints(nums)
var result [][]int
for i := 0; i < l-2; i++ {
// for j := i + 1; j < l; j++ {
// for k := j + 1; k < l; k++ {
// if nums[i]+nums[j]+nums[k] == 0 {
// result = append(result, []int{nums[i], nums[j], nums[k]})
// }
// }
// }
target := -nums[i]
tmap := make(map[int]int)
for k, v := range nums[i+1:] {
if _, ok := tmap[target-v]; !ok {
tmap[v] = k
} else {
result = append(result, []int{nums[i], nums[tmap[target-v]+i+1], nums[k+i+1]})
}
}
}
return removeDupSliceOfMetrix(result)
}
func threeSumFast(nums []int) [][]int {
l := len(nums)
if l < 3 {
return nil
}
sort.Ints(nums)
var result [][]int
var tempSlice []int
var lIndex, rIndex, target int
for i := 0; i < l-2; i++ {
lIndex = i + 1
rIndex = l - 1
target = -nums[i]
for lIndex < rIndex {
if nums[lIndex]+nums[rIndex] == target {
tempSlice = []int{nums[i], nums[lIndex], nums[rIndex]}
if len(result) == 0 || !sliceEqual(result[len(result)-1], tempSlice) {
result = append(result, tempSlice)
}
lIndex++
rIndex--
} else if nums[lIndex]+nums[rIndex] > target {
rIndex--
} else {
lIndex++
}
}
}
return removeDupSliceOfMetrix(result)
}
func removeDupSliceOfMetrix(m [][]int) [][]int {
result := [][]int{}
for i := range m {
flag := true
for j := range result {
if sliceEqual(m[i], result[j]) {
flag = false
break
}
}
if flag {
result = append(result, m[i])
}
}
return result
}
// s1,s2 is already sorted and has the same length
func sliceEqual(s1, s2 []int) bool {
for i := 0; i < len(s1); i++ {
if s1[i] != s2[i] {
return false
}
}
return true
}
func testThreeSum() {
//nums := []int{-1, 0, 1, 2, -1, -4}
//nums := []int{9, 14, 0, -8, 10, 0, 2, 9, -8, 13, -3, 1, 10, -13, 4, 3, -3, -11, 8, -13, -4, -6, 5, -10, -14, 0, 3, -9, -9, -7, -11, 8, -8, -4, -15, 9, 11, 3, 3, -11, -7, 7, 5, -12, 1, -14, -1, 13, -9, -8, 7, 2, -6, -11, -1, -5, -4, -13, -7, 2, -13, -2, -5, -6, 9, -12, 10, -2, -2, -10, 2, 6, 4, 14, 2, -10, -15, -14, 10, -9, -15, -6, 0, -6, -2, 14, -3, 9, 8, -3, -12, 10, 2, -9, 11, -3, -6, -2, 10, 7, 3, -11, -10, -8, -12, -1}
nums := []int{82597, -9243, 62390, 83030, -97960, -26521, -61011, 83390, -38677, 12333, 75987, 46091, 83794, 19355, -71037, -6242, -28801, 324, 1202, -90885, -2989, -95597, -34333, 35528, 5680, 89093, -90606, 50360, -29393, -27012, 53313, 65213, 99818, -82405, -41661, -3333, -51952, 72135, -1523, 26377, 74685, 96992, 92263, 15929, 5467, -99555, -43348, -41689, -60383, -3990, 32165, 65265, -72973, -58372, 12741, -48568, -46596, 72419, -1859, 34153, 62937, 81310, -61823, -96770, -54944, 8845, -91184, 24208, -29078, 31495, 65258, 14198, 85395, 70506, -40908, 56740, -12228, -40072, 32429, 93001, 68445, -73927, 25731, -91859, -24150, 10093, -60271, -81683, -18126, 51055, 48189, -6468, 25057, 81194, -58628, 74042, 66158, -14452, -49851, -43667, 11092, 39189, -17025, -79173, 13606, 83172, 92647, -59741, 19343, -26644, -57607, 82908, -20655, 1637, 80060, 98994, 39331, -31274, -61523, 91225, -72953, 13211, -75116, -98421, -41571, -69074, 99587, 39345, 42151, -2460, 98236, 15690, -52507, -95803, -48935, -46492, -45606, -79254, -99851, 52533, 73486, 39948, -7240, 71815, -585, -96252, 90990, -93815, 93340, -71848, 58733, -14859, -83082, -75794, -82082, -24871, -15206, 91207, -56469, -93618, 67131, -8682, 75719, 87429, -98757, -7535, -24890, -94160, 85003, 33928, 75538, 97456, -66424, -60074, -8527, -28697, -22308, 2246, -70134, -82319, -10184, 87081, -34949, -28645, -47352, -83966, -60418, -15293, -53067, -25921, 55172, 75064, 95859, 48049, 34311, -86931, -38586, 33686, -36714, 96922, 76713, -22165, -80585, -34503, -44516, 39217, -28457, 47227, -94036, 43457, 24626, -87359, 26898, -70819, 30528, -32397, -69486, 84912, -1187, -98986, -32958, 4280, -79129, -65604, 9344, 58964, 50584, 71128, -55480, 24986, 15086, -62360, -42977, -49482, -77256, -36895, -74818, 20, 3063, -49426, 28152, -97329, 6086, 86035, -88743, 35241, 44249, 19927, -10660, 89404, 24179, -26621, -6511, 57745, -28750, 96340, -97160, -97822, -49979, 52307, 79462, 94273, -24808, 77104, 9255, -83057, 77655, 21361, 55956, -9096, 48599, -40490, -55107, 2689, 29608, 20497, 66834, -34678, 23553, -81400, -66630, -96321, -34499, -12957, -20564, 25610, -4322, -58462, 20801, 53700, 71527, 24669, -54534, 57879, -3221, 33636, 3900, 97832, -27688, -98715, 5992, 24520, -55401, -57613, -69926, 57377, -77610, 20123, 52174, 860, 60429, -91994, -62403, -6218, -90610, -37263, -15052, 62069, -96465, 44254, 89892, -3406, 19121, -41842, -87783, -64125, -56120, 73904, -22797, -58118, -4866, 5356, 75318, 46119, 21276, -19246, -9241, -97425, 57333, -15802, 93149, 25689, -5532, 95716, 39209, -87672, -29470, -16324, -15331, 27632, -39454, 56530, -16000, 29853, 46475, 78242, -46602, 83192, -73440, -15816, 50964, -36601, 89758, 38375, -40007, -36675, -94030, 67576, 46811, -64919, 45595, 76530, 40398, 35845, 41791, 67697, -30439, -82944, 63115, 33447, -36046, -50122, -34789, 43003, -78947, -38763, -89210, 32756, -20389, -31358, -90526, -81607, 88741, 86643, 98422, 47389, -75189, 13091, 95993, -15501, 94260, -25584, -1483, -67261, -70753, 25160, 89614, -90620, -48542, 83889, -12388, -9642, -37043, -67663, 28794, -8801, 13621, 12241, 55379, 84290, 21692, -95906, -85617, -17341, -63767, 80183, -4942, -51478, 30997, -13658, 8838, 17452, -82869, -39897, 68449, 31964, 98158, -49489, 62283, -62209, -92792, -59342, 55146, -38533, 20496, 62667, 62593, 36095, -12470, 5453, -50451, 74716, -17902, 3302, -16760, -71642, -34819, 96459, -72860, 21638, 47342, -69897, -40180, 44466, 76496, 84659, 13848, -91600, -90887, -63742, -2156, -84981, -99280, 94326, -33854, 92029, -50811, 98711, -36459, -75555, 79110, -88164, -97397, -84217, 97457, 64387, 30513, -53190, -83215, 252, 2344, -27177, -92945, -89010, 82662, -11670, 86069, 53417, 42702, 97082, 3695, -14530, -46334, 17910, 77999, 28009, -12374, 15498, -46941, 97088, -35030, 95040, 92095, -59469, -24761, 46491, 67357, -66658, 37446, -65130, -50416, 99197, 30925, 27308, 54122, -44719, 12582, -99525, -38446, -69050, -22352, 94757, -56062, 33684, -40199, -46399, 96842, -50881, -22380, -65021, 40582, 53623, -76034, 77018, -97074, -84838, -22953, -74205, 79715, -33920, -35794, -91369, 73421, -82492, 63680, -14915, -33295, 37145, 76852, -69442, 60125, -74166, 74308, -1900, -30195, -16267, -60781, -27760, 5852, 38917, 25742, -3765, 49097, -63541, 98612, -92865, -30248, 9612, -8798, 53262, 95781, -42278, -36529, 7252, -27394, -5021, 59178, 80934, -48480, -75131, -54439, -19145, -48140, 98457, -6601, -51616, -89730, 78028, 32083, -48904, 16822, -81153, -8832, 48720, -80728, -45133, -86647, -4259, -40453, 2590, 28613, 50523, -4105, -27790, -74579, -17223, 63721, 33489, -47921, 97628, -97691, -14782, -65644, 18008, -93651, -71266, 80990, -76732, -47104, 35368, 28632, 59818, -86269, -89753, 34557, -92230, -5933, -3487, -73557, -13174, -43981, -43630, -55171, 30254, -83710, -99583, -13500, 71787, 5017, -25117, -78586, 86941, -3251, -23867, -36315, 75973, 86272, -45575, 77462, -98836, -10859, 70168, -32971, -38739, -12761, 93410, 14014, -30706, -77356, -85965, -62316, 63918, -59914, -64088, 1591, -10957, 38004, 15129, -83602, -51791, 34381, -89382, -26056, 8942, 5465, 71458, -73805, -87445, -19921, -80784, 69150, -34168, 28301, -68955, 18041, 6059, 82342, 9947, 39795, 44047, -57313, 48569, 81936, -2863, -80932, 32976, -86454, -84207, 33033, 32867, 9104, -16580, -25727, 80157, -70169, 53741, 86522, 84651, 68480, 84018, 61932, 7332, -61322, -69663, 76370, 41206, 12326, -34689, 17016, 82975, -23386, 39417, 72793, 44774, -96259, 3213, 79952, 29265, -61492, -49337, 14162, 65886, 3342, -41622, -62659, -90402, -24751, 88511, 54739, -21383, -40161, -96610, -24944, -602, -76842, -21856, 69964, 43994, -15121, -85530, 12718, 13170, -13547, 69222, 62417, -75305, -81446, -38786, -52075, -23110, 97681, -82800, -53178, 11474, 35857, 94197, -58148, -23689, 32506, 92154, -64536, -73930, -77138, 97446, -83459, 70963, 22452, 68472, -3728, -25059, -49405, 95129, -6167, 12808, 99918, 30113, -12641, -26665, 86362, -33505, 50661, 26714, 33701, 89012, -91540, 40517, -12716, -57185, -87230, 29914, -59560, 13200, -72723, 58272, 23913, -45586, -96593, -26265, -2141, 31087, 81399, 92511, -34049, 20577, 2803, 26003, 8940, 42117, 40887, -82715, 38269, 40969, -50022, 72088, 21291, -67280, -16523, 90535, 18669, 94342, -39568, -88080, -99486, -20716, 23108, -28037, 63342, 36863, -29420, -44016, 75135, 73415, 16059, -4899, 86893, 43136, -7041, 33483, -67612, 25327, 40830, 6184, 61805, 4247, 81119, -22854, -26104, -63466, 63093, -63685, 60369, 51023, 51644, -16350, 74438, -83514, 99083, 10079, -58451, -79621, 48471, 67131, -86940, 99093, 11855, -22272, -67683, -44371, 9541, 18123, 37766, -70922, 80385, -57513, -76021, -47890, 36154, 72935, 84387, -92681, -88303, -7810, 59902, -90, -64704, -28396, -66403, 8860, 13343, 33882, 85680, 7228, 28160, -14003, 54369, -58893, 92606, -63492, -10101, 64714, 58486, 29948, -44679, -22763, 10151, -56695, 4031, -18242, -36232, 86168, -14263, 9883, 47124, 47271, 92761, -24958, -73263, -79661, -69147, -18874, 29546, 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-98810, 96727, -91939, 29119, -85473, -82153, -69008, 44850, 74299, -76459, -86464, 8315, -49912, -28665, 59052, -69708, 76024, -92738, 50098, 18683, -91438, 18096, -19335, 35659, 91826, 15779, -73070, 67873, -12458, -71440, -46721, 54856, 97212, -81875, 35805, 36952, 68498, 81627, -34231, 81712, 27100, -9741, -82612, 18766, -36392, 2759, 41728, 69743, 26825, 48355, -17790, 17165, 56558, 3295, -24375, 55669, -16109, 24079, 73414, 48990, -11931, -78214, 90745, 19878, 35673, -15317, -89086, 94675, -92513, 88410, -93248, -19475, -74041, -19165, 32329, -26266, -46828, -18747, 45328, 8990, -78219, -25874, -74801, -44956, -54577, -29756, -99822, -35731, -18348, -68915, -83518, -53451, 95471, -2954, -13706, -8763, -21642, -37210, 16814, -60070, -42743, 27697, -36333, -42362, 11576, 85742, -82536, 68767, -56103, -63012, 71396, -78464, -68101, -15917, -11113, -3596, 77626, -60191, -30585, -73584, 6214, -84303, 18403, 23618, -15619, -89755, -59515, -59103, -74308, -63725, -29364, -52376, -96130, 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21652, -46053, -80578, -61382, 68487, -6417, 4656, 20811, 67013, -30868, -11219, 46, 74944, 14627, 56965, 42275, -52480, 52162, -84883, -52579, -90331, 92792, 42184, -73422, -58440, 65308, -25069, 5475, -57996, 59557, -17561, 2826, -56939, 14996, -94855, -53707, 99159, 43645, -67719, -1331, 21412, 41704, 31612, 32622, 1919, -69333, -69828, 22422, -78842, 57896, -17363, 27979, -76897, 35008, 46482, -75289, 65799, 20057, 7170, 41326, -76069, 90840, -81253, -50749, 3649, -42315, 45238, -33924, 62101, 96906, 58884, -7617, -28689, -66578, 62458, 50876, -57553, 6739, 41014, -64040, -34916, 37940, 13048, -97478, -11318, -89440, -31933, -40357, -59737, -76718, -14104, -31774, 28001, 4103, 41702, -25120, -31654, 63085, -3642, 84870, -83896, -76422, -61520, 12900, 88678, 85547, 33132, -88627, 52820, 63915, -27472, 78867, -51439, 33005, -23447, -3271, -39308, 39726, -74260, -31874, -36893, 93656, 910, -98362, 60450, -88048, 99308, 13947, 83996, -90415, -35117, 70858, -55332, -31721, 97528, 82982, 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7461, 31621, 61047, 51476, 56512, 11839, -96916, -82739, 28924, -99927, 58449, 37280, 69357, 11219, -32119, -62050, -48745, -83486, -52376, 42668, 82659, 68882, 38773, 46269, -96005, 97630, 25009, -2951, -67811, 99801, 81587, -79793, -18547, -83086, 69512, 33127, -92145, -88497, 47703, 59527, 1909, 88785, -88882, 69188, -46131, -5589, -15086, 36255, -53238, -33009, 82664, 53901, 35939, -42946, -25571, 33298, 69291, 53199, 74746, -40127, -39050, 91033, 51717, -98048, 87240, 36172, 65453, -94425, -63694, -30027, 59004, 88660, 3649, -20267, -52565, -67321, 34037, 4320, 91515, -56753, 60115, 27134, 68617, -61395, -26503, -98929, -8849, -63318, 10709, -16151, 61905, -95785, 5262, 23670, -25277, 90206, -19391, 45735, 37208, -31992, -92450, 18516, -90452, -58870, -58602, 93383, 14333, 17994, 82411, -54126, -32576, 35440, -60526, -78764, -25069, -9022, -394, 92186, -38057, 55328, -61569, 67780, 77169, 19546, -92664, -94948, 44484, -13439, 83529, 27518, -48333, 72998, 38342, -90553, -98578, -76906, 81515, -16464, 78439, 92529, 35225, -39968, -10130, -7845, -32245, -74955, -74996, 67731, -13897, -82493, 33407, 93619, 59560, -24404, -57553, 19486, -45341, 34098, -24978, -33612, 79058, 71847, 76713, -95422, 6421, -96075, -59130, -28976, -16922, -62203, 69970, 68331, 21874, 40551, 89650, 51908, 58181, 66480, -68177, 34323, -3046, -49656, -59758, 43564, -10960, -30796, 15473, -20216, 46085, -85355, 41515, -30669, -87498, 57711, 56067, 63199, -83805, 62042, 91213, -14606, 4394, -562, 74913, 10406, 96810, -61595, 32564, 31640, -9732, 42058, 98052, -7908, -72330, 1558, -80301, 34878, 32900, 3939, -8824, 88316, 20937, 21566, -3218, -66080, -31620, 86859, 54289, 90476, -42889, -15016, -18838, 75456, 30159, -67101, 42328, -92703, 85850, -5475, 23470, -80806, 68206, 17764, 88235, 46421, -41578, 74005, -81142, 80545, 20868, -1560, 64017, 83784, 68863, -97516, -13016, -72223, 79630, -55692, 82255, 88467, 28007, -34686, -69049, -41677, 88535, -8217, 68060, -51280, 28971, 49088, 49235, 26905, -81117, -44888, 40623, 74337, -24662, 97476, 79542, -72082, -35093, 98175, -61761, -68169, 59697, -62542, -72965, 59883, -64026, -37656, -92392, -12113, -73495, 98258, 68379, -21545, 64607, -70957, -92254, -97460, -63436, -8853, -19357, -51965, -76582, 12687, -49712, 45413, -60043, 33496, 31539, -57347, 41837, 67280, -68813, 52088, -13155, -86430, -15239, -45030, 96041, 18749, -23992, 46048, 35243, -79450, 85425, -58524, 88781, -39454, 53073, -48864, -82289, 39086, 82540, -11555, 25014, -5431, -39585, -89526, 2705, 31953, -81611, 36985, -56022, 68684, -27101, 11422, 64655, -26965, -63081, -13840, -91003, -78147, -8966, 41488, 1988, 99021, -61575, -47060, 65260, -23844, -21781, -91865, -19607, 44808, 2890, 63692, -88663, -58272, 15970, -65195, -45416, -48444, -78226, -65332, -24568, 42833, -1806, -71595, 80002, -52250, 30952, 48452, -90106, 31015, -22073, 62339, 63318, 78391, 28699, 77900, -4026, -76870, -45943, 33665, 9174, -84360, -22684, -16832, -67949, -38077, -38987, -32847, 51443, -53580, -13505, 9344, -92337, 26585, 70458, -52764, -67471, -68411, -1119, -2072, -93476, 67981, 40887, -89304, -12235, 41488, 1454, 5355, -34855, -72080, 24514, -58305, 3340, 34331, 8731, 77451, -64983, -57876, 82874, 62481, -32754, -39902, 22451, -79095, -23904, 78409, -7418, 77916}
r := threeSumFast(nums)
fmt.Println(r)
fmt.Println(len(r))
}