Submission #1145185

#	Time	Username	Problem	Language	Result	Execution time	Memory
1145185		mansur	Table Tennis (info1cup20_tabletennis)	C++20	87 / 100	3087 ms	4360 KiB

tabletennis

//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")
 
#include<bits/stdc++.h>	
 
using namespace std;
 
#define all(a) a.begin(), a.end()                                                   
#define rall(a) a.rbegin(), a.rend()                 
#define sz(a) (int)a.size()
#define s second
#define f first
 
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
 
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
     
vector<pii> rid = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}};
vector<pii> dir = {{-1, -1}, {-1, 1}, {1, -1}, {1, 1}};
 
const int N = 1e6 + 1, mod = 998244353;
 
const ll inf = 1e9;
 
double eps = 1e-15;
                                                
bool flg = 0;

void slv() {
	int n, k;
	cin >> n >> k;
	int m = n + k;
	int a[m + 1];
	for (int i = 1; i <= m; i++) cin >> a[i];
	int l[m + 1], r[m + 1];
	for (int i = 1; i <= m; i++) {
    	l[i] = i;
    	if (i <= 2) {
    		l[i] = 1;
    		continue;
    	}
    	if (a[i] - a[i - 1] == a[i - 1] - a[i - 2]) l[i] = l[i - 1]; 
    }
    for (int i = m; i >= 1; i--) {
    	r[i] = i;
    	if (i >= m - 1) {
    		r[i] = m;
    		continue;
    	}
    	if (a[i] - a[i + 1] == a[i + 1] - a[i + 2]) r[i] = r[i + 1];
    }
    for (int i = 1; i <= min(m, k + 1); i++) {
		for (int j = m; j >= max(1, m - k) && i + (m - j) - 1 <= k; j--) {
			int v = a[i] + a[j];
			vector<int> ansl, ansr;
			int x = i, y = j, cnt = i + m - j - 1;
			while (x <= y) {
				if (a[x] + a[y] < v) {
					x++, cnt++;
					continue;
				}
				if (a[x] + a[y] > v) {
                	y--, cnt++;
                	continue;
                }
                int len = min(r[x] - x + 1, y - l[y] + 1);
                len = min(len, (y - x + 1) / 2);
                x += len, y -= len;
			}
			//cout << i << ' ' << j << ' ' << v << ' ' << cnt << endl;
			if (cnt > k) continue;
			x = i, y = j, cnt = i + m - j - 1;
			while (x <= y) {
				if (a[x] + a[y] < v) {
					x++, cnt++;
					continue;
				}
				if (a[x] + a[y] > v) {
                	y--, cnt++;
                	continue;
                }
                int len = min(r[x] - x + 1, y - l[y] + 1);
                len = min(len, (y - x + 1) / 2);
                while (len-- && sz(ansl) + sz(ansr) < n) {
                	ansl.push_back(a[x++]);
                	ansr.push_back(a[y--]);
                }
                if (sz(ansl) + sz(ansr) == n) break;
			}
			for (int x: ansl) cout << x << ' ';
			reverse(all(ansr));
			for (int x: ansr) cout << x << ' ';
			return;
		}
    }
}       	                                                                    
 
main() {
	//freopen("input.txt", "r", stdin);                                                                                     
	//freopen("output.txt", "w", stdout);                                                                                     
	ios_base::sync_with_stdio(0);	                                                                                       
	cin.tie(0);
	int tp = 1;
	if (flg) cin >> tp;
	while (tp--) {  	
		slv();
	}
}
//wenomechainsama      

Compilation message (stderr)

tabletennis.cpp:100:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  100 | main() {
      | ^~~~

• Subtask 1: 11 / 11
• Subtask 2: 9 / 9
• Subtask 3: 14 / 14
• Subtask 4: 15 / 15
• Subtask 5: 9 / 9
• Subtask 6: 14 / 14
• Subtask 7: 15 / 15
• Subtask 8: 0 / 13