Submission #225977

#	Time	Username	Problem	Language	Result	Execution time	Memory
225977		Fasho	Lasers (NOI19_lasers)	C++14	24 / 100	137 ms	14016 KiB

lasers

#include <bits/stdc++.h>
#define N 1000005
#define ll long long int 	
#define MP make_pair
#define pb push_back
#define ppb pop_back
#define sp " "
#define endl "\n"
#define fi first
#define se second
#define ii pair<int,int>
#define lli pair<ll,ll>
#define fast cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(false)
#define fast2 freopen ("badhair.gir","r",stdin);freopen ("badhair.cik","w",stdout);
#define mod 1000000007
#define fs(x,y) for(ll i=1;i<=y;i++) cin>>x[i]
#define fo(i,x,y) for(ll i=x;i<=y;i++)
#define INF 1000000000005
#define ull unsigned long long int
using namespace std;

ll n,m,ar[N],sum,t,l,suf[N];

vector<lli> v;

int main()
{
	fast;

	// cout<<endl;

	cin>>l>>t;
	while(t--)
	{
		cin>>n;
		ll top=0;
		fs(ar,n);
		int ind=1;
		fo(i,1,n+1)
		suf[i]=0;
		for(int i=n;i>=1;i--)
			suf[i]=suf[i+1]+ar[i];
		fo(i,1,n)
		{
			ind=top;
			ll x=suf[i+1];
			x+=ind;
			x=l-x;
			x=2*ar[i]-x;
			top+=ar[i];
			if(x<=0)
				continue;
			ind++;
			ll y=ar[i]-x;
			// cout<<i<<sp<<ind<<sp<<x<<sp<<y<<endl;
			v.pb({ind+y,ind+y+x-1});
		}
	}
	sort(v.begin(),v.end());
	ll mk=0;
	for(int i=0;i<v.size();i++)
	{
		ll a=v[i].fi;
		ll b=v[i].se;
		if(b<mk)
			continue;
		mk=max(mk+1,a);
		sum+=b-mk+1;
		mk=max(mk,b);
	}
	cout<<sum;


}

Compilation message (stderr)

lasers.cpp: In function 'int main()':
lasers.cpp:61:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<v.size();i++)
              ~^~~~~~~~~

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