Submission #643433

#	Time	Username	Problem	Language	Result	Execution time	Memory
643433		GaLz	Lasers (NOI19_lasers)	C++14	100 / 100	461 ms	58548 KiB

lasers

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
const ll mod=1e9+7;
const ll maxn=5e5+5;
const ll INF=1e18;
#define ok ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fi first
#define se second
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define endl '\n'
int l, r, x, u, sum[maxn], ls, st, cnt;
vi row[maxn];
map<int, int> mp, ans;
int main() {
    ok
    cin >> l >> r;
    for(int i=1; i<=r; i++) {
        cin >> x;
        for(int j=0; j<x; j++) {
            cin >> u;
            row[i].pb(u);
            sum[i]+=u;
        }
    }
    for(int i=1; i<=r; i++) {
        mp[l-sum[i]+1]++;
        mp[l+1]--;
        int lf=0, rg=l-sum[i]+1;
        x=row[i].size();
        for(int j=0; j<x-1; j++) {
            lf+=row[i][j];
            rg+=row[i][j];
            mp[1]++;
            mp[lf+1]--;
            mp[rg]++;
            mp[l+1]--;
        }
        mp[1]++;
        mp[sum[i]+1]--;
        ls=0; st=0;
        for(auto it : mp) {
            it.se+=ls;
            ls=it.se;
            if(it.se==x+1 && !st) {
                st=it.fi;
            } else if(it.se!=x+1 && st) {
                ans[st]++;
                ans[it.fi]--;
                st=0;
            }
        }
        mp.clear();
    }
    ls=0; st=0;
    for(auto it : ans) {
        it.se+=ls;
        ls=it.se;
        if(it.se>0 && !st) {
            st=it.fi;
        } else if(it.se<=0 && st) {
            cnt+=it.fi-st;
            st=0;
        }
    }
    cout << cnt;
}

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