Submission #736193

#	Time	Username	Problem	Language	Result	Execution time	Memory
736193		onebit1024	Lasers (NOI19_lasers)	C++17	100 / 100	173 ms	16500 KiB

lasers

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define pb push_back
#define all(c) c.begin(), c.end()
#define endl "\n"

const double PI=3.141592653589;


void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define dbg(x...) cerr << "LINE(" << __LINE__ << ") -> " <<"[" << #x << "] = ["; _print(x)
#else
#define dbg(x...)
#endif



void solve()
{
    int L,n;
    cin >> L >> n;
    vector<pair<int,int>>tot;
    for(int i = 1;i<=n;++i){
        int x;
        cin >> x;
        vector<int>a(x+1);
        int sum = 0;
        for(int j= 1;j<=x;++j)cin >> a[j],sum+=a[j];
        int space = L-sum;
        sum = 0;
        int curr = 1;
        vector<pair<int,int>>range;
        for(int j = 1;j<=x;++j){
            if(space)range.pb({curr,curr+space-1});
            sum+=a[j];
            curr = sum+1;
        }
        if(space)range.pb({curr,L});
        vector<pair<int,int>>not_safe;
        for(int j = 1;j<(int)(range.size());++j){
            if(range[j].first > range[j-1].second+1)not_safe.pb({range[j-1].second+1,range[j].first-1});
        }
        if(!space)not_safe.pb({1,L});
        for(auto x : not_safe)tot.pb(x);
    }
    sort(all(tot));
    int res = 0;
    int r = 1;
    if(!tot.empty())r = tot[0].second, res+= (tot[0].second-tot[0].first+1);
    for(int j = 1;j<(int)(tot.size());++j){
        if(tot[j].second > r){
            res+=tot[j].second-max(r+1,tot[j].first)+1;
        }
        r = max(r, tot[j].second);
    }
    cout << res << endl;
}   

int32_t main()
{

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);


    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    

    int T=1;
    for(int i = 1;i<=T;++i)
    {
        // cout << "Case #" << i << ": ";
        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