82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
#include <cstdio>
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#include <iostream>
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#include <cstring>
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#include <algorithm>
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#include <cmath>
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using namespace std;
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#define N 1000020
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int n, k, num[2], m, ans, sl, ssl;
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int ss[N], s[N];
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bool v[10002];
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struct node {
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int pre, val, mod;
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} q[N];
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void bfs() {
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memset(v, false, sizeof(v));
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int l = 1, r = 1;
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for (int i=0; i<m; i++) if (num[i]) {
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q[r].pre = 0; q[r].mod = num[i] % n;
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q[r].val = num[i];
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if (q[r].mod == 0) { ans = r; break; }
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r++;
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}
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while (l < r && ans == -1) {
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for (int i=0; i<m; i++) {
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q[r].mod = (q[l].mod * k + num[i]) % n;
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if (!v[q[r].mod]) {
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v[q[r].mod] = true;
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q[r].pre = l;
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q[r].val = num[i];
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if (q[r].mod == 0) { ans = r; break; }
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r++;
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}
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}
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l++;
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}
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}
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int cmp() {
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if (sl < ssl) return -1;
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if (sl > ssl) return 1;
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for (int i=0; i<sl; i++) if (s[i] != ss[i]) return s[i]-ss[i];
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return 0;
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}
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void cpy() {
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ssl = sl;
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for (int i=0; i<sl; i++) ss[i] = s[i];
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}
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void get_s(int x) {
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if (x == 0) return ;
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get_s(q[x].pre); s[sl++] = q[x].val;
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}
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void print() {
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for (int i=0; i<ssl; i++) printf("%d", ss[i]);
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printf("\n");
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}
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int main() {
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while (scanf("%d%d", &n, &k) == 2) {
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ssl = 0;
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for (int i=1; i<k; i++) {
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num[0] = i, m = 1;
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ans = -1;
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bfs();
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if (ans != -1) {
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sl = 0; get_s(ans);
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if (cmp() < 0 || ssl == 0) cpy();
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}
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}
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if (ssl == 0) {
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for (int i=0; i<k; i++) for (int j=i+1; j<k; j++) {
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num[0] = i, num[1] = j; m = 2;
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ans = -1;
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bfs();
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if (ans != -1) {
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sl = 0; get_s(ans);
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if (cmp() < 0 || ssl == 0) cpy();
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}
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}
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}
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print();
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}
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return 0;
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}
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