Submission #1008155

#	Time	Username	Problem	Language	Result	Execution time	Memory
1008155		kebine	Lasers (NOI19_lasers)	C++17	0 / 100	20 ms	16316 KiB

lasers

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"

const int MAXN = 1e6 + 5;
vector < int > freq ( MAXN, 0);
int n, q;

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0);

    cin >> n >> q;
    while ( q-- ){
        int k; cin >> k;
        int yes = n;
        int a[k + 5]; 
        for ( int i = 1; i <= k; i++){
            cin >> a[i];
        }

        sort ( a + 1, a + 1 + k, greater < int >());

        for ( int i = 1; i <= k; i++){
            for ( int j = max ( yes - a[i] + 1, 1ll ); j <= a[i]; j++){
                freq[j]++;
                ///cout << j << " ";
            }       
            yes -= a[i];
        }
    }

    int ans = 0;

    int l = 1, r = n;
    while ( l < r ){
        if ( freq[l] ) freq[r] = 1;
        l++; r--;
    }

    for ( int i = 1; i <= n; i++) if ( freq[i] ) ans++;

    cout << ans << endl;
    
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 14
• Subtask 3: 0 / 20
• Subtask 4: 0 / 21
• Subtask 5: 0 / 22
• Subtask 6: 0 / 13