4sum.py

__author__ = 'yuyue'


def solution(nums, target):
        snums = sorted(nums)
        length = len(snums)
        result = []
        if length<4:
            return result
        s = 0
        while s < length - 1:
            t=s+1
            while t < length:
                j = length - 1
                i = t + 1
                while i < j:
                    if j == t or snums[i] + snums[j] + snums[t] + snums[s] > target:
                        j -= 1
                    elif i == t or snums[i] + snums[j] + snums[t] + snums[s] < target:
                        i += 1
                    else:
                        result.append([snums[s],snums[t], snums[i], snums[j]])
                        while i < j and snums[i] == snums[i + 1]:
                            i += 1
                        while t < length - 1 and snums[t] == snums[t + 1]:
                            t += 1
                        if i < j:
                            i += 1
                t+=1
            s += 1

        return result


data = [91277418, 66271374, 38763793, 4092006, 11415077, 60468277, 1122637, 72398035, -62267800, 22082642, 60359529,
        -16540633, 92671879, -64462734, -55855043, -40899846, 88007957, -57387813, -49552230, -96789394, 18318594,
        -3246760, -44346548, -21370279, 42493875, 25185969, 83216261, -70078020, -53687927, -76072023, -65863359,
        -61708176, -29175835, 85675811, -80575807, -92211746, 44755622, -23368379, 23619674, -749263, -40707953,
        -68966953, 72694581, -52328726, -78618474, 40958224, -2921736, -55902268, -74278762, 63342010, 29076029,
        58781716, 56045007, -67966567, -79405127, -45778231, -47167435, 1586413, -58822903, -51277270, 87348634,
        -86955956, -47418266, 74884315, -36952674, -29067969, -98812826, -44893101, -22516153, -34522513, 34091871,
        -79583480, 47562301, 6154068, 87601405, -48859327, -2183204, 17736781, 31189878, -23814871, -35880166, 39204002,
        93248899, -42067196, -49473145, -75235452, -61923200, 64824322, -88505198, 20903451, -80926102, 56089387,
        -58094433, 37743524, -71480010, -14975982, 19473982, 47085913, -90793462, -33520678, 70775566, -76347995,
        -16091435, 94700640, 17183454, 85735982, 90399615, -86251609, -68167910, -95327478, 90586275, -99524469,
        16999817, 27815883, -88279865, 53092631, 75125438, 44270568, -23129316, -846252, -59608044, 90938699, 80923976,
        3534451, 6218186, 41256179, -9165388, -11897463, 92423776, -38991231, -6082654, 92275443, 74040861, 77457712,
        -80549965, -42515693, 69918944, -95198414, 15677446, -52451179, -50111167, -23732840, 39520751, -90474508,
        -27860023, 65164540, 26582346, -20183515, 99018741, -2826130, -28461563, -24759460, -83828963, -1739800,
        71207113, 26434787, 52931083, -33111208, 38314304, -29429107, -5567826, -5149750, 9582750, 85289753, 75490866,
        -93202942, -85974081, 7365682, -42953023, 21825824, 68329208, -87994788, 3460985, 18744871, -49724457,
        -12982362, -47800372, 39958829, -95981751, -71017359, -18397211, 27941418, -34699076, 74174334, 96928957,
        44328607, 49293516, -39034828, 5945763, -47046163, 10986423, 63478877, 30677010, -21202664, -86235407, 3164123,
        8956697, -9003909, -18929014, -73824245]
print solution(data, -236727523)