Submission #1275967

#	Time	Username	Problem	Language	Result	Execution time	Memory
1275967		lioow	Lasers (NOI19_lasers)	C++20	100 / 100	78 ms	8668 KiB

lasers

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define pb push_back
#define int long long
#define repp(i,x,n) for(int i=x;i<=n;i++)
#define rep(i,x,n) for(int i=x;i>=n;i--)
#define r0 return 0
#define fi first
#define se second
#define liow ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define jelek cout<<"jelek"<<endl
#define pii pair<int,int>
#define all(v) v.begin(),v.end()
#define tp tuple<int,int,int>
#define fl fflush(stdout)
#define ld long double
#pragma GCC optimize ("O2")
#pragma GCC optimize ("unroll-loops")  
#define pil pair<int,int>
#define p3 pair<int,pii>
#define p5 pair<int,pair<pii,pii>>
using namespace std;
using namespace __gnu_pbds;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
typedef tree<pair<int,int>, null_type,  less<pair<int,int>>, rb_tree_tag, tree_order_statistics_node_update> ordered_multiset;
//const int mod=1e9+7;
const int SQMAX=635,INF=1e18;
const int mod=998244353;
//const int MOD=1e6+3;
mt19937_64 rng((unsigned int) chrono::steady_clock::now().time_since_epoch().count());
pii dr[8]={{-1,0},{-1,1},{0,1},{1,1},{1,0},{1,-1},{0,-1},{-1,-1}};
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
int dxx[4]={1,1,-1,-1};
int dyy[4]={1,-1,-1,1};
int mul(int x,int y){return (x%mod*y%mod)%mod;}
int expo(int b,int e){
  if(e==0) return 1;
  int tmp=expo(b,e/2);
  if(e%2) return mul(tmp,mul(tmp,b));
  else return mul(tmp,tmp);
}
const int maxn=100005;
const int N=1e5;

void solve(){
	int L,N;cin>>L>>N;
    vector<pii>seg;
	repp(i,1,N){
		int x;cin>>x;
		int sum=0;
		vector<int>v;
		repp(j,1,x){
			int y;cin>>y;
			v.pb(y);
			sum+=y;
		}
		int sisa=L-sum;
		int nw=0;
        int tot=0;
		repp(i,0,x-1){
            tot=sisa+v[i];
			int lewat=v[i]-sisa;

            int l=nw+1,r=nw+sisa+v[i];
            if(lewat<=0){
                nw+=v[i];
                continue;
            }
			if(tot%2){
                seg.pb({(l+r)/2-lewat/2,(l+r)/2+lewat/2});
            } else {
                seg.pb({(l+r)/2-lewat/2+1,(l+r)/2+lewat/2});
            }
			nw+=v[i];
		}
	}
    if(seg.empty()){
        cout<<0<<endl;
        return;
    }
    sort(all(seg));
    int ans=0;
    repp(i,0,seg.size()-1){
        int l=seg[i].fi;
        int r=seg[i].se;
        while(i+1<=seg.size()-1 && r>=seg[i+1].fi){
            i++;
            r=max(r,seg[i].se);
        }
        ans+=(r-l+1);
    }
    cout<<ans<<endl;
}

signed main(){
	liow;
	solve();
}

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