122 lines
2.2 KiB
C++
122 lines
2.2 KiB
C++
/* Problem URL: https://cses.fi/problemset/task/1755 */
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#include <bits/stdc++.h>
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using namespace std;
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#define V vector
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#define rmin(a, b) a = min(a, b)
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#define rmax(a, b) a = max(a, b)
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#define rep(i, lim) for (int i = 0; i < (lim); i++)
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#define nrep(i, s, lim) for (int i = s; i < (lim); i++)
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#define repv(i, v) for (auto &i : (v))
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#define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; }
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#define sortv(v) sort(v.begin(), v.end())
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#define all(v) (v).begin(), (v).end()
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using vi = vector<int>;
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using vvi = vector<vi>;
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using vvvi = vector<vvi>;
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using vvvvi = vector<vvvi>;
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using ll = long long;
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using vl = vector<ll>;
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using vvl = vector<vl>;
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using vvvl = vector<vvl>;
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using vvvvl = vector<vvvl>;
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template<class v>
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auto operator<<(ostream &os, const vector<v> &vec)->ostream& {
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os << vec[0];
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for (size_t i = 1; i < vec.size(); i++) {
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os << ' ' << vec[i];
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}
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os << '\n';
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return os;
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}
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template<class v>
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auto operator>>(istream &is, vector<v> &vec)->istream& {
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for (auto &i : vec) {
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is >> i;
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}
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return is;
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}
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template<class v>
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auto operator<<(ostream &os, const vector<vector<v>> &vec)->ostream& {
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for (auto &i : vec) {
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os << i[0];
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for (size_t j = 1; j < i.size(); j++) {
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os << ' ' << i[j];
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}
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os << '\n';
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}
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return os;
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}
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template<class v>
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auto operator>>(istream &is, vector<vector<v>> &vec)->istream& {
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for (auto &i : vec) {
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for (auto &j : i) {
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is >> j;
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}
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}
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return is;
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}
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int main()
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{
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ios::sync_with_stdio(false);
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cin.tie(nullptr);
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string a;
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cin >> a;
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vi count(26);
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repv(i, a) {
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count[i - 'A']++;
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}
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int odds = 0;
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int odd = -1;
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rep(i, 26) {
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if (count[i] & 1) {
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odds++;
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odd = i;
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}
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}
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if (odds > 1) {
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cout << "NO SOLUTION\n";
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return 0;
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}
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if (odd != -1) {
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count[odd]--;
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}
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rep(i, 26) {
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rep(j, count[i] / 2) {
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cout << (char)(i + 'A');
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}
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}
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if (odd != -1) {
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cout << (char)(odd + 'A');
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}
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for (int i = 25; i >= 0; i--) {
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nrep(j, count[i] / 2, count[i]) {
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cout << (char)(i + 'A');
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}
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}
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cout << '\n';
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}
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