Submission #796367

#	Time	Username	Problem	Language	Result	Execution time	Memory
796367		12345678	Lasers (NOI19_lasers)	C++17	41 / 100	1063 ms	3328 KiB

lasers

#include <bits/stdc++.h>

using namespace std;

const int nx=5e5+5, mx=1e6+5;
int n, l, x, s[nx], ans;
bool c[mx];

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>l>>n;
    for (int i=0; i<n; i++)
    {
        cin>>s[i];
        vector<int> v(s[i]+1);
        for (int j=1; j<=s[i]; j++) cin>>v[j], v[j]+=v[j-1];
        if (v[v.size()-1]>(l/2))
        {
            for (int j=1; j<=v[v.size()-1]; j++)
            {
                auto x=*prev(lower_bound(v.begin()+1, v.end(), j));
                if ((v[v.size()-1]-x)>l-j) c[j]=1;
            }
        }
    }
    for (int i=1; i<=l; i++) if (c[i]) ans++;
    cout<<ans;
}

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