Submission #1135023

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135023		steveonalex	Table Tennis (info1cup20_tabletennis)	C++20	100 / 100	235 ms	38644 KiB

tabletennis

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()

ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}

ll gcd(ll a, ll b){return __gcd(a, b);}
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ll mask){return __builtin_ctzll(mask);}
int logOf(ll mask){return __lg(mask);}

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}

template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }

template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }

template <class T>
    void printArr(T& container, string separator = " ", string finish = "\n"){
        for(auto item: container) cout << item << separator;
        cout << finish;
    }


template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

void solve(){
    int n, k; cin >> n >> k;
    n += k;
    vector<int> a(n);
    for(int i = 0; i < n; ++i) cin >> a[i];

    map<int, int> mp;
    for(int i = 0; i < min(n, k * 2); ++i) 
    for(int j = max(i + 1, n - k * 2); j < n; ++j){
        mp[a[i] + a[j]]++;
    }

    vector<pair<int, int>> sigma;
    for(pair<int, int> i: mp){
        sigma.push_back(make_pair(i.second, i.first));
    }
    sort(ALL(sigma), greater<pair<int,int>>());

    for(auto i: sigma){
        int skipped = 0;
        int sum = i.second;
        int l = 0, r = n - 1;
        while(l < r){
            while(l < r && a[l] + a[r] != sum){
                if (a[l] + a[r] < sum) l++;
                else r--;
                skipped++;
            }
            if (l >= r) break;
            l++; r--;
        }
        if (skipped == k){
            vector<int> ans;
            int l = 0, r = n - 1;
            while(l < r){
                while(l < r && a[l] + a[r] != sum){
                    if (a[l] + a[r] < sum) l++;
                    else r--;
                    skipped++;
                }
                if (l >= r) break;
                ans.push_back(a[l]); ans.push_back(a[r]);
                l++; r--;
            }
            sort(ALL(ans));
            printArr(ans);

            return;
        }
    }
}

int main(void){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    clock_t start = clock();

    solve();

    cerr << "Time elapsed: " << clock() - start << "ms!\n";
    return 0;
}

• 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: 13 / 13