#include <iostream> using namespace std; int main() { // 标记1-10洞是否被找到 bool find1 = false; bool find2 = false; bool find3 = false; bool find4 = false; bool find5 = false; bool find6 = false; bool find7 = false; bool find8 = false; bool find9 = false; bool find10 = false; // 循环1000次查找 for (int k = 1; k <= 1000; k++) { long long sum = (long long)k * (k + 1) / 2; int rem = sum % 10; int hole; if (rem == 0) { hole = 10; } else { hole = rem; } // 标记对应洞 if (hole == 1) find1 = true; if (hole == 2) find2 = true; if (hole == 3) find3 = true; if (hole == 4) find4 = true; if (hole == 5) find5 = true; if (hole == 6) find6 = true; if (hole == 7) find7 = true; if (hole == 8) find8 = true; if (hole == 9) find9 = true; if (hole == 10) find10 = true; } cout << "不会被搜到的洞："; if (!find1) cout << "1 "; if (!find2) cout << "2 "; if (!find3) cout << "3 "; if (!find4) cout << "4 "; if (!find5) cout << "5 "; if (!find6) cout << "6 "; if (!find7) cout << "7 "; if (!find8) cout << "8 "; if (!find9) cout << "9 "; if (!find10) cout << "10 "; return 0; }