Submission #1040962

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040962		7again	Lasers (NOI19_lasers)	C++17	100 / 100	178 ms	13772 KiB

lasers

#include <bits/stdc++.h>
#define int long long
#define double long double
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define FAST ios::sync_with_stdio(0);cout.tie(0);cin.tie(0)
//#define endl "\n"
#define f first
#define s second
#define pb push_back
#define in insert

//#define ind(v,t) distance(v.begin(),t)
using namespace std ;

int MOD = 1e18 ;
const int N = 500005 ;

//int fib(int n){double phi=(1+sqrt(5))/2;return round((pow(phi,n)-pow(1-phi,n))/sqrt(5));}
//void setIO(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
int fstpow(int a, int b){if(b==0)return 1;int ans=fstpow(a,b/2)%MOD;ans=ans%MOD*ans%MOD;if(b&1)return a*ans%MOD;return ans%MOD;}
int inv(int x){return fstpow(x,MOD-2);}
int DMOD(int x,int y){x%=MOD;y%=MOD;return fstpow(x,inv(y));}
int MMOD(int x,int y){x%=MOD;y%=MOD;return (x*y)%MOD;}
//int AMOD(int x,int y){x%=MOD;y%=MOD;return (x+y)%MOD;}
int SMOD(int x,int y){x%=MOD;y%=MOD;return (x-y+MOD)%MOD;}
//int Factorial[N];void FAC(){Factorial[0]=1;for(int i=1;i<=2e6;i++)Factorial[i]=(Factorial[i-1]%MOD*i%MOD)%MOD;}
//int PREFIX[3e6];void PFX(){PREFIX[0]=0;for(int i=1;i<=2e6;i++)PREFIX[i]=PREFIX[i]+PREFIX[i-1]+i;}
//fill_n(&a[0][0],(n+1)*(m+1),valu);
//int C(int x,int y){int A=1,B=1;for(int i=y+1;i<=x;i++)A*=i;for(int i=2;i<=x-y;i++)B*=i;return A/B;}

pair <int , int> pfx[N] ;
void slv()
{
    int n , m ;
    cin >> n >> m ;

    int p = 0 ;
    for(int t = 0 ; t < m ; t++)
    {
        int s ;
        cin >> s ;

        vector <int> v(s) ;
        double sum = 0 , sum2 = 0 ;
        for(int i = 0 ; i < s ; i++)
        {
            cin >> v[i] ;
            sum += v[i] ;
        }

        for(int i = 0 ; i < s ; i++)
        {
            int l = n - (sum - sum2) + 1 , r = sum2 + v[i] + 1 ;
            if(r > l)
                pfx[++p] = {l , r - 1} ;
            sum2 += v[i] ;
        }
    }

    sort(pfx + 1 , pfx + p + 1) ;
    int ans = 0;
    int l = 0 , r = -1 ;
    for(int i = 1 ; i <= p ; i++)
    {
        if(pfx[i].f > r)
        {
            ans += r - l + 1 ;
            l = pfx[i].f ;
            r = pfx[i].s ;
        }

        else
        {
            r = max(r , pfx[i].s) ;
        }
    }
    ans += r - l + 1 ;
    cout << ans ;
}
main()
{

    //FAST ;

    int t = 1 ;
    //cin >> t ;

    while(t--)
        slv() ;
}

//TLE Problem ?
/*
    -> const MOD
    -> const int
    -> FAST
    -> "/n" | endl
    -> array size
*/

//MLE Problem ?
/*
    -> array size()
    -> N ?
    -> long long
    -> define
    -> long long dp[1000][100000] ? ;
*/

//RTE problem ?
/*
    -> array size ?
    -> x / 0 ?
*/

Compilation message (stderr)

lasers.cpp:81:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   81 | main()
      | ^~~~

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