Submission #1249085

#	Time	Username	Problem	Language	Result	Execution time	Memory
1249085		Geforgs	Lasers (NOI19_lasers)	C++20	0 / 100	1095 ms	11072 KiB

lasers

#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
#include <algorithm>
#include <set>
#include <queue>
#include <map>
#include <stack>
#include <bitset>
#include <string>
#include <cstring>
#include <iterator>
#include <random>
#define ll long long
#define ld long double
#define inf (ll)(2*1e18)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define pb push_back
#define endl "\n"
using namespace std;

void solve(){
    ll n, q, i, j, k, l, r, x, y, cnt=0;
    cin>>n>>q;
    if(n > 1e6 + 7) while(true);
    vector<ll> a(n+1, 0);
    for(i=0;i<q;++i){
        cin>>k;
        vector<ll> b(k);
        vector<ll> c(k);
        vector<ll> d(k);
        for(j=0;j<k;++j){
            cin>>b[j];
        }
        for(j=1;j<k;++j){
            c[j] = c[j-1] + b[j-1];
        }
        for(j=k-1;j>=0;--j){
            d[j] = d[j+1] + b[j+1];
        }
        for(j=0;j<k;++j){
            x = n - c[j] - d[j];
            y = x - b[j];
            if(y < b[j]){
                ++a[y + c[j]];
                --a[b[j] + c[j]];
            }
        }
    }
    cnt += a[0] != 0;
    for(i=1;i<n;++i){
        a[i] += a[i-1];
        cnt += a[i] != 0;
    }
    cout<<cnt<<endl;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    srand(time(nullptr));
    ll t=1;
//    cin>>t;
    for(;t>0;--t){
        solve();
    }
    return 0;
}

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