CSES-solutions/CSES Problem Set/Palindrome Reorder.cpp
Segcolt 8b03716512 Add a lot more of my solutions.
I don't remember which ones doesn't pass though
2025-09-12 14:51:10 -03:00

122 lines
2.2 KiB
C++

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