1和2组成5位数字,一共有多少种排列方式?输出每种排列

#include using namespace std; int main() { int i[5]; for (i[0] = 1; i[0] <= 2; ++i[0]) { for (i[1] = 1; i[1] <= 2; ++i[1]) { for (i[2] = 1; i[2] <= 2; ++i[2]) { for (i[3] = 1; i[3] <= 2; ++i[3]) { for