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Submission #496032

# Submission time Handle Problem Language Result Execution time Memory
496032 2021-12-20T12:51:01 Z AlperenT Drvca (COCI19_drvca) C++17
110 / 110
 46 ms 4092 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 5;

int n, arr[N], dif, cur, nxt;

bool vis[N];

vector<int> a, b, ansa, ansb;

bool check(vector<int> v){
    for(int i = 2; i < v.size(); i++) if(arr[v[i]] - arr[v[i - 1]] != arr[v[1]] - arr[v[0]]) return false;
    return true;
}

int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);

    cin >> n;

    for(int i = 1; i <= n; i++) cin >> arr[i];

    sort(arr + 1, arr + n + 1);

    if(arr[1] != arr[2]){
        a.clear(), b.clear(); memset(vis, 0, sizeof(vis));

        a.push_back(1); a.push_back(2);
        vis[1] = vis[2] = true;

        dif = arr[2] - arr[1];

        cur = 2;

        while(true){
            nxt = lower_bound(arr + 1, arr + n + 1, arr[cur] + dif) - arr;
            if(nxt > n || arr[nxt] != arr[cur] + dif) break;
            vis[nxt] = true;
            a.push_back(nxt);
            cur = nxt;
        }

        cur = -1;

        for(int i = 1; i <= n; i++){
            if(!vis[i]){
                if(b.size() < 2){
                    b.push_back(i);
                    cur = i;
                }
            }
        }

        if(b.size() == 2){
            dif = arr[b[1]] - arr[b[0]];

            while(true){
                nxt = lower_bound(arr + 1, arr + n + 1, arr[cur] + dif) - arr;

                if(nxt > n || arr[nxt] != arr[cur] + dif) break;
                else if(vis[nxt]){
                    if(nxt + 1 <= n && arr[nxt + 1] == arr[nxt]) nxt++;
                    else{
                        while(a.back() >= nxt){
                            vis[a.back()] = false;
                            a.pop_back();
                        }
                    }
                }

                vis[nxt] = true;
                b.push_back(nxt);
                cur = nxt;
            }
        }

        if(check(a) && check(b) && a.size() + b.size() == n) ansa = a, ansb = b;
    }
    else{
        a.clear(), b.clear();

        for(int i = 1; i <= n; i++){
            if(arr[i] == arr[1]) a.push_back(i);
            else b.push_back(i);
        }

        if(check(a) && check(b) && a.size() + b.size() == n) ansa = a, ansb = b;
    }

    if(n >= 3 && arr[1] != arr[3]){
        a.clear(), b.clear(); memset(vis, 0, sizeof(vis));

        a.push_back(1); a.push_back(3);
        vis[1] = vis[3] = true;

        dif = arr[3] - arr[1];

        cur = 3;

        while(true){
            nxt = lower_bound(arr + 1, arr + n + 1, arr[cur] + dif) - arr;
            if(nxt > n || arr[nxt] != arr[cur] + dif) break;
            vis[nxt] = true;
            a.push_back(nxt);
            cur = nxt;
        }

        cur = -1;

        for(int i = 1; i <= n; i++){
            if(!vis[i]){
                if(b.size() < 2){
                    b.push_back(i);
                    cur = i;
                }
            }
        }

        if(b.size() == 2){
            dif = arr[b[1]] - arr[b[0]];

            while(true){
                nxt = lower_bound(arr + 1, arr + n + 1, arr[cur] + dif) - arr;

                if(nxt > n || arr[nxt] != arr[cur] + dif) break;
                else if(vis[nxt]){
                    if(nxt + 1 <= n && arr[nxt + 1] == arr[nxt]) nxt++;
                    else{
                        while(a.back() >= nxt){
                            vis[a.back()] = false;
                            a.pop_back();
                        }
                    }
                }
                vis[nxt] = true;
                b.push_back(nxt);
                cur = nxt;
            }
        }

        if(check(a) && check(b) && a.size() + b.size() == n) ansa = a, ansb = b;
    }
    
    if(n >= 3 && arr[2] != arr[3]){
        a.clear(), b.clear(); memset(vis, 0, sizeof(vis));

        a.push_back(2); a.push_back(3);
        vis[2] = vis[3] = true;

        dif = arr[3] - arr[2];

        cur = 3;

        while(true){
            nxt = lower_bound(arr + 1, arr + n + 1, arr[cur] + dif) - arr;
            if(nxt > n || arr[nxt] != arr[cur] + dif) break;
            vis[nxt] = true;
            a.push_back(nxt);
            cur = nxt;
        }

        cur = -1;

        for(int i = 1; i <= n; i++){
            if(!vis[i]){
                if(b.size() < 2){
                    b.push_back(i);
                    cur = i;
                }
            }
        }

        if(b.size() == 2){
            dif = arr[b[1]] - arr[b[0]];

            while(true){
                nxt = lower_bound(arr + 1, arr + n + 1, arr[cur] + dif) - arr;

                if(nxt > n || arr[nxt] != arr[cur] + dif) break;
                else if(vis[nxt]){
                    if(nxt + 1 <= n && arr[nxt + 1] == arr[nxt]) nxt++;
                    else{
                        while(a.back() >= nxt){
                            vis[a.back()] = false;
                            a.pop_back();
                        }
                    }
                }
                vis[nxt] = true;
                b.push_back(nxt);
                cur = nxt;
            }
        }

        if(check(a) && check(b) && a.size() + b.size() == n) ansa = a, ansb = b;
    }
    else if(n >= 3){
        a.clear(), b.clear();

        for(int i = 1; i <= n; i++){
            if(arr[i] == arr[2]) a.push_back(i);
            else b.push_back(i);
        }

        if(check(a) && check(b) && a.size() + b.size() == n) ansa = a, ansb = b;
    }

    if(ansb.size() > ansa.size()) swap(ansb, ansa);

    if(ansa.size() == 0) cout << -1;
    else{
        if(ansb.size() == 0) ansb.push_back(ansa.back()), ansa.pop_back();

        cout << ansa.size() << "\n";
        for(auto i : ansa) cout << arr[i] << " ";
        cout << "\n";

        cout << ansb.size() << "\n";
        for(auto i : ansb) cout << arr[i] << " ";
        cout << "\n";
    }
}

Compilation message

drvca.cpp: In function 'bool check(std::vector<int>)':
drvca.cpp:14:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i = 2; i < v.size(); i++) if(arr[v[i]] - arr[v[i - 1]] != arr[v[1]] - arr[v[0]]) return false;
      |                    ~~^~~~~~~~~~
drvca.cpp: In function 'int main()':
drvca.cpp:79:56: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   79 |         if(check(a) && check(b) && a.size() + b.size() == n) ansa = a, ansb = b;
      |                                    ~~~~~~~~~~~~~~~~~~~~^~~~
drvca.cpp:89:56: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   89 |         if(check(a) && check(b) && a.size() + b.size() == n) ansa = a, ansb = b;
      |                                    ~~~~~~~~~~~~~~~~~~~~^~~~
drvca.cpp:143:56: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  143 |         if(check(a) && check(b) && a.size() + b.size() == n) ansa = a, ansb = b;
      |                                    ~~~~~~~~~~~~~~~~~~~~^~~~
drvca.cpp:197:56: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  197 |         if(check(a) && check(b) && a.size() + b.size() == n) ansa = a, ansb = b;
      |                                    ~~~~~~~~~~~~~~~~~~~~^~~~
drvca.cpp:207:56: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  207 |         if(check(a) && check(b) && a.size() + b.size() == n) ansa = a, ansb = b;
      |                                    ~~~~~~~~~~~~~~~~~~~~^~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 1 ms 412 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 0 ms 320 KB Output is correct
13 Correct 1 ms 208 KB Output is correct
14 Correct 1 ms 336 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 1 ms 412 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 0 ms 320 KB Output is correct
13 Correct 1 ms 208 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 424 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 0 ms 336 KB Output is correct
22 Correct 1 ms 336 KB Output is correct
23 Correct 1 ms 336 KB Output is correct
24 Correct 1 ms 324 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 1 ms 336 KB Output is correct
27 Correct 1 ms 336 KB Output is correct
28 Correct 0 ms 336 KB Output is correct
29 Correct 1 ms 324 KB Output is correct
30 Correct 1 ms 336 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 2740 KB Output is correct
2 Correct 36 ms 2748 KB Output is correct
3 Correct 37 ms 2748 KB Output is correct
4 Correct 37 ms 2784 KB Output is correct
5 Correct 37 ms 2752 KB Output is correct
6 Correct 38 ms 2796 KB Output is correct
7 Correct 40 ms 2672 KB Output is correct
8 Correct 36 ms 2740 KB Output is correct
9 Correct 37 ms 2488 KB Output is correct
10 Correct 40 ms 2752 KB Output is correct
11 Correct 21 ms 3776 KB Output is correct
12 Correct 0 ms 312 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 1 ms 412 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 0 ms 320 KB Output is correct
13 Correct 1 ms 208 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 424 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 0 ms 336 KB Output is correct
22 Correct 1 ms 336 KB Output is correct
23 Correct 1 ms 336 KB Output is correct
24 Correct 1 ms 324 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 1 ms 336 KB Output is correct
27 Correct 1 ms 336 KB Output is correct
28 Correct 0 ms 336 KB Output is correct
29 Correct 1 ms 324 KB Output is correct
30 Correct 1 ms 336 KB Output is correct
31 Correct 40 ms 2740 KB Output is correct
32 Correct 36 ms 2748 KB Output is correct
33 Correct 37 ms 2748 KB Output is correct
34 Correct 37 ms 2784 KB Output is correct
35 Correct 37 ms 2752 KB Output is correct
36 Correct 38 ms 2796 KB Output is correct
37 Correct 40 ms 2672 KB Output is correct
38 Correct 36 ms 2740 KB Output is correct
39 Correct 37 ms 2488 KB Output is correct
40 Correct 40 ms 2752 KB Output is correct
41 Correct 21 ms 3776 KB Output is correct
42 Correct 0 ms 312 KB Output is correct
43 Correct 40 ms 3792 KB Output is correct
44 Correct 30 ms 2544 KB Output is correct
45 Correct 34 ms 3080 KB Output is correct
46 Correct 39 ms 3732 KB Output is correct
47 Correct 27 ms 2360 KB Output is correct
48 Correct 35 ms 3196 KB Output is correct
49 Correct 40 ms 3772 KB Output is correct
50 Correct 27 ms 2276 KB Output is correct
51 Correct 41 ms 3236 KB Output is correct
52 Correct 46 ms 3896 KB Output is correct
53 Correct 28 ms 2368 KB Output is correct
54 Correct 35 ms 3072 KB Output is correct
55 Correct 40 ms 4092 KB Output is correct
56 Correct 21 ms 3820 KB Output is correct
57 Correct 21 ms 3756 KB Output is correct
58 Correct 1 ms 336 KB Output is correct