Submission #1174497

#	Time	Username	Problem	Language	Result	Execution time	Memory
1174497		Pacybwoah	DEL13 (info1cup18_del13)	C++20	0 / 100	1 ms	320 KiB

del13

#include<iostream>
#include<vector>
#include<algorithm>
#include<utility>
#include<cmath>
using namespace std;
typedef long long ll;
const ll inf = 1e18;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int t;
    cin >> t;
    while(t--){
        int n, k;
        cin >> n >> k;
        vector<pair<int, pair<int, int>>> rngs;
        vector<int> vec(n + 1);
        for(int i = 0; i < k; i++){
            int tmp;
            cin >> tmp;
            vec[tmp] = 1;
        }
        int lst = 1;
        for(int i = 2; i <= n; i++){
            if(vec[i - 1] != vec[i]){
                rngs.emplace_back(vec[i - 1], make_pair(lst, i - 1));
                lst = i;
            }
        }
        rngs.emplace_back(vec[n], make_pair(lst, n));
        if(rngs.back().first == 1) rngs.pop_back();
        if(!rngs.empty() && rngs[0].first == 1){
            rngs.erase(rngs.begin());
        }
        int sum = 0;
        int cnt = 0;
        bool flag = 0;
        vector<pair<int, int>> vals;
        for(auto &[val, info]: rngs){
            auto &[l, r] = info;
            if(val == 1){
                if(l < r){
                    if(sum % 2 == 1 || cnt == 1){
                        flag = 1;
                        break;
                    }
                    sum = 0;
                    cnt = 0;
                }
            }
            else sum += r - l + 1, cnt++, vals.emplace_back(l, r);
        }
        if(sum % 2 == 1 || cnt == 1){
            flag = 1;
        }
        if(flag){
            cout << "-1\n";
            continue;
        }
        cout << (n - k) / 2 << "\n";
        vector<int> ans;
        int a = vals[0].second - vals[0].first + 1, b = vals[1].second - vals[1].first + 1, mid = vals[0].second + 1;
        if(a == b){
            for(int i = 0; i < a; i++) ans.push_back(mid);
        }
        else if(a > b){
            for(int i = 0; i < b; i++) ans.push_back(mid);
            a -= b;
            int mid2 = mid - a / 2 - 1;
            for(int i = 0; i < a / 2; i++) ans.push_back(mid2);
        }
        else{
            for(int i = 0; i < a; i++) ans.push_back(mid);
            b -= a;
            int mid2 = mid + b / 2 + 1;
            for(int i = 0; i < b / 2; i++) ans.push_back(mid2);
        }
        reverse(ans.begin(), ans.end());
        for(auto &x: ans) cout << x << " ";
        cout << "\n";
    }
}
// g++ -std=c++17 -Wall -Wextra -Wshadow -fsanitize=undefined -fsanitize=address -o run pB.cpp -g

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