# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
483193 | rk42745417 | Cheerleaders (info1cup20_cheerleaders) | C++17 | 300 ms | 11024 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define EmiliaMyWife ios::sync_with_stdio(0); cin.tie(0);
using ll = int64_t;
using uint = uint32_t;
using ull = uint64_t;
using ld = long double;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9 + 7;
const double EPS = 1e-8;
const ll LINF = ll(1e18) + ll(1e15);
static auto LamyIsCute = []() {
EmiliaMyWife
return 48763;
}();
signed main() {
int n;
cin >> n;
if(n == 0) {
cout << "0\n";
return 0;
}
auto rot = [&](int &a) {
a = (a >> 1) | ((a & 1) << (n - 1));
};
vector<int> arr(1 << n);
for(int i = 0; i < (1 << n); i++) {
int x;
cin >> x;
arr[x] = i;
}
int a, b;
ll mn = LINF;
for(int i = 0; i < n; i++) {
//for(int x : arr)
//cout << x << ' ';
//cout << '\n';
ll res = 0;
int w = 0;
vector<vector<ll>> cost(n, vector<ll>(2));
vector<vector<int>> cnt(n, vector<int>(1 << n));
for(int j = 0; j < (1 << n); j++) {
for(int k = 0; k < n; k++) {
int r = arr[j] >> k;
cost[k][r & 1] += cnt[k][r ^ 1];
}
for(int k = 0; k < n; k++)
cnt[k][arr[j] >> k]++;
}
for(int i = 0; i < n; i++) {
if(cost[i][1] < cost[i][0])
w ^= 1 << i;
res += min(cost[i][1], cost[i][0]);
}
if(res < mn) {
mn = res;
a = i;
b = w;
}
for(int &x : arr)
rot(x);
}
string s(a, '2');
for(int i = 0, w = 0; i < n; i++) {
if(b >> w & 1)
s += '1';
s += '2';
w = (w - 1 + n) % n;
}
cout << mn << '\n' << s << '\n';
}
Compilation message (stderr)
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