Submission #646106

#	Time	Username	Problem	Language	Result	Execution time	Memory
646106		ghostwriter	Building 4 (JOI20_building4)	C++14	0 / 100	1 ms	340 KiB

building4

#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include <debug.h>
#else
#define debug(...)
#endif
#define ft front
#define bk back
#define st first
#define nd second
#define ins insert
#define ers erase
#define pb push_back
#define pf push_front
#define _pb pop_back
#define _pf pop_front
#define lb lower_bound
#define ub upper_bound
#define mtp make_tuple
#define bg begin
#define ed end
#define all(x) (x).bg(), (x).ed()
#define sz(x) (int)(x).size()
typedef long long ll; typedef unsigned long long ull;
typedef double db; typedef long double ldb;
typedef pair<int, int> pi; typedef pair<ll, ll> pll;
typedef vector<int> vi; typedef vector<ll> vll; typedef vector<pi> vpi; typedef vector<pll> vpll;
typedef string str;
template<typename T> T gcd(T a, T b) { return (b == 0? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }
#define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
#define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
#define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
#define FSN(i, n) for (int (i) = (n) - 1; (i) >= 0; --(i))
#define EACH(i, x) for (auto &(i) : (x))
#define WHILE while
#define file "TEST"
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) { return uniform_int_distribution<ll>(l, r)(rd); }
/*
----------------------------------------------------------------
    END OF TEMPLATE
----------------------------------------------------------------
    Tran The Bao - ghostwriter
    Training for VOI23 gold medal
----------------------------------------------------------------
    DIT ME CHUYEN BAO LOC
----------------------------------------------------------------
*/
const int N = 1e6 + 1;
int n, a[N], b[N];
signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    // freopen(file".inp", "r", stdin);
    // freopen(file".out", "w", stdout);
    cin >> n;
    FOR(i, 1, 2 * n) cin >> a[i];
    FOR(i, 1, 2 * n) cin >> b[i];
    FOR(i, 1, (1 << (2 * n)) - 1) {
    	int cnt = __builtin_popcount(i);
    	if (cnt != n) continue;
    	FOR(j, 0, 2 * n - 1)
    		if (i & (1 << j))
    			swap(a[j + 1], b[j + 1]);
    	bool ok = 1;
    	FOR(j, 2, 2 * n)
    		if (a[j] < a[j - 1])
    			ok = 0;
    	if (!ok) {
    		FOR(j, 0, 2 * n - 1)
	    		if (i & (1 << j))
	    			swap(a[j + 1], b[j + 1]);
    		continue;
    	}
    	FOR(j, 0, 2 * n - 1)
    		if (i & (1 << j)) cout << 'B';
    		else cout << 'A';
    	return 0;
    }
    cout << -1;
    return 0;
}
/*
3
2 5 4 9 15 11
6 7 6 8 12 14
----------------------------------------------------------------
From Benq:
    stuff you should look for
        * int overflow, array bounds
        * special cases (n=1?)
        * do smth instead of nothing and stay organized
        * WRITE STUFF DOWN
        * DON'T GET STUCK ON ONE APPROACH
----------------------------------------------------------------
*/

Compilation message (stderr)

building4.cpp: In function 'int main()':
building4.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
building4.cpp:58:5: note: in expansion of macro 'FOR'
   58 |     FOR(i, 1, 2 * n) cin >> a[i];
      |     ^~~
building4.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
building4.cpp:59:5: note: in expansion of macro 'FOR'
   59 |     FOR(i, 1, 2 * n) cin >> b[i];
      |     ^~~
building4.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
building4.cpp:60:5: note: in expansion of macro 'FOR'
   60 |     FOR(i, 1, (1 << (2 * n)) - 1) {
      |     ^~~
building4.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
building4.cpp:63:6: note: in expansion of macro 'FOR'
   63 |      FOR(j, 0, 2 * n - 1)
      |      ^~~
building4.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
building4.cpp:67:6: note: in expansion of macro 'FOR'
   67 |      FOR(j, 2, 2 * n)
      |      ^~~
building4.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
building4.cpp:71:7: note: in expansion of macro 'FOR'
   71 |       FOR(j, 0, 2 * n - 1)
      |       ^~~
building4.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
building4.cpp:76:6: note: in expansion of macro 'FOR'
   76 |      FOR(j, 0, 2 * n - 1)
      |      ^~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 89