Submission #685244

#	Time	Username	Problem	Language	Result	Execution time	Memory
685244		Farhan_HY	Drvca (COCI19_drvca)	C++14	0 / 110	27 ms	3032 KiB

drvca

#include <bits/stdc++.h>
#define int long long
#define F first
#define S second
#define T int t; cin >> t; while(t--)
#define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
using namespace std;

const int N = 1e5 + 5;
const int M = 1e3 + 3;
const int inf = 1e18;
const int mod = 1e9 + 7;
int n, a[N];
vector<int> v1, v2;

bool ok(int i, int j) {
    v1.clear();
    v2.clear();
    int d = a[j] - a[i];
    v1.push_back(a[i]);
    v1.push_back(a[j]);
    for(int k = 1; k <= j; k++)
        if (k != i && k != j) v2.push_back(a[k]);
    for(int k = j + 1; k <= n; k++) {
        if (a[k] - v1.back() == d) v1.push_back(a[k]);
        else v2.push_back(a[k]);
    }
    bool q = 1;
    for(int k = 1; k < v2.size(); k++)
        q &= (v2[k] - v2[k - 1] == v2[1] - v2[0]);
    return q;
}

main() {
    IOS
    cin >> n;
    for(int i = 1; i <= n; i++) cin >> a[i];
    sort(a, a + n + 1);
    bool ans = 0;
    if (n == 2) {
        cout << 1 << '\n' << a[1] << "\n1\n" << a[2];
        return 0;
    }
    for(int i = 1; i <= 2; i++) {
        for(int j = i + 1; j <= 3; j++) {
            ans |= ok(i, j);
            if (ans) break;
        }
        if (ans) break;
    }
    if (!ans) {
        cout << -1;
        return 0;
    }
    cout << v1.size() << '\n';
    for(auto x: v1) cout << x << ' ';
    cout << '\n';
    cout << v2.size() << '\n';
    for(auto x: v2) cout << x << ' ';
}

Compilation message (stderr)

drvca.cpp: In function 'bool ok(long long int, long long int)':
drvca.cpp:29:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for(int k = 1; k < v2.size(); k++)
      |                    ~~^~~~~~~~~~~
drvca.cpp: At global scope:
drvca.cpp:34:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   34 | main() {
      | ^~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30