Submission #95032

#	Time	Username	Problem	Language	Result	Execution time	Memory
95032		Osama_Alkhodairy	DEL13 (info1cup18_del13)	C++17	6 / 100	17 ms	1144 KiB

del13

#include <bits/stdc++.h>
using namespace std;
#define finish(x) return cout << x << endl, 0
#define ll long long

void solve(){
    int n, k;
    cin >> n >> k;
    vector <int> a;
    for(int i = 0 ; i < k ; i++){
        int x;
        cin >> x;
        a.push_back(x);
    }
    a.push_back(0);
    a.push_back(n + 1);
    sort(a.begin(), a.end());
    vector <int> b;
    for(int i = 1 ; i < (int)a.size() ; i++)
        b.push_back(a[i] - a[i - 1] - 1);
    for(auto &i : b)
        while(i >= 3)
            i -= 2;
    for(int i = 0 ; i < (int)b.size() ; i++){
        if(b[i] == 0) continue;
        if(i + 1 >= (int)b.size() || b[i] != b[i + 1]){
            cout << -1 << endl;
            return;
        }
        i++;
    }
    cout << 0 << endl << endl;
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int T;
    cin >> T;
    while(T--) solve();
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 6 / 15
• Subtask 4: 0 / 25
• Subtask 5: 0 / 30