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#include <stdio.h> int main() { int arr[] = { 1,2,3,4,1,2,3 }; int sz = sizeof(arr) / sizeof(arr[0]); int dog = 0; for (int i = 0; i < sz; i++) { dog ^= arr[i];//dog = dog ^ arr[i] } printf("单身狗是:%d",dog); return 0; }