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https://git.sb/baoshuo/OI-codes.git
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99 lines
1.5 KiB
C++
99 lines
1.5 KiB
C++
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#include <iostream>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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std::string s, t;
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int cnt[10];
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void add(int x, int f = 1) {
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switch (x) {
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case 4:
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cnt[3] += f;
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cnt[2] += 2 * f;
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break;
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case 6:
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cnt[5] += f;
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cnt[3] += f;
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break;
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case 8:
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cnt[7] += f;
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cnt[2] += 3 * f;
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break;
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case 9:
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cnt[7] += f;
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cnt[3] += 2 * f;
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cnt[2] += f;
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break;
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default:
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cnt[x] += f;
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break;
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}
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> s;
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for (char c : s) {
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add(c - '0');
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}
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while (cnt[7] >= 1 && cnt[3] >= 2 && cnt[2] >= 1) {
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add(9, -1);
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t.push_back('9');
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}
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while (cnt[7] >= 1 && cnt[2] >= 3) {
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add(8, -1);
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t.push_back('8');
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}
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while (cnt[7]) {
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add(7, -1);
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t.push_back('7');
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}
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while (cnt[5] && cnt[3]) {
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add(6, -1);
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t.push_back('6');
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}
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while (cnt[5]) {
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add(5, -1);
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t.push_back('5');
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}
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while (cnt[3] >= 1 && cnt[2] >= 2) {
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add(4, -1);
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t.push_back('4');
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}
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while (cnt[3]) {
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add(3, -1);
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t.push_back('3');
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}
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while (cnt[2]) {
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add(2, -1);
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t.push_back('2');
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}
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cout << (t.empty() ? "?????" : t) << endl;
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return 0;
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}
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