36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
#include <bits/stdc++.h>
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using namespace std;
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typedef long long LL;
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int main() {
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LL base = 34; // 数字n
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int digits = 2; // 后2位
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LL mod = 100;
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int k = 20; // 执行多少次方模拟
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LL result = 1; // Initialize result (base^0 = 1)
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map<LL, int> st; // Track positions of trailing digits
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int cycle_start = -1, cycle_length = -1;
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for (int i = 1; i <= k; i++) {
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result = (result * base) % mod; // Calculate trailing digits of base^i
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printf("%d^%2d = %40lld trailing digits: %02lld",
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base, i, (LL)pow(base, i), result);
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if (st[result]) {
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cycle_start = st[result];
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cycle_length = i - cycle_start;
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printf(" \n\nCycle detected! Starts at %d, length = %d\n",
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cycle_start, cycle_length);
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break;
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}
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st[result] = i;
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printf("\n");
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}
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if (cycle_length != -1) {
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cout << "\n============================\n";
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cout << "Simulation result: Trailing 2 digits cycle length = " << cycle_length << endl;
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}
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return 0;
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} |