3-sum问题

给定一个整数数组，判断能否从中找出3个数a、b、c，使得他们的和为0，如果能，请找出所有满足和为0个3个数对。

#define SIZE 10void judgeAndPut(int* arr, int target, int begin, int end) {while (begin < end) {if (arr[begin] + arr[end] + arr[target] > 0) {end--;} else if (arr[begin] + arr[end] + arr[target] < 0) {begin++;} else {cout << " " << arr[target] << " " << arr[begin] << " " << arr[end]<< endl;begin++;end--;while (begin + 1 < end && arr[begin - 1] == arr[begin]) {begin++;}while (end - 1 > begin && arr[end + 1] == arr[end]) {end--;}}}}void findThreeSumEq0(int* arr) {qsort(arr, SIZE, sizeof(int), myCmp);for (int i = 0; i < SIZE; i++) {cout << " " << arr[i];}cout << endl;for (int i = 0; i < SIZE - 2; ++i) {if (i != 0 && arr[i] == arr[i - 1]) {continue;}judgeAndPut(arr, i, i + 1, SIZE - 1);}}