Submission #336393

#	Time	Username	Problem	Language	Result	Execution time	Memory
336393		talant117408	Bigger segments (IZhO19_segments)	C++17	13 / 100	1 ms	364 KiB

segments

/*
    Code written by Talant I.D.
*/
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>

//using namespace __gnu_pbds;
using namespace std;

//typedef tree <int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
  
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
  
inline bool isvowel(char ch){
    ch = tolower(ch);
    return (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u');
}
  
inline bool isprime(int n){
    if(n < 2 || (n%2 == 0 && n != 2)) return false;
    for(int i = 3; i*i <= n; i++)
        if(n%i == 0) return false;
    return true;
}
 
class Union{
    private:
        vector <int> saizu, link;
    public:
        Union(int n){
            saizu.assign(n, 1); link.resize(n); 
            iota(all(link), 0);
        }
        int find(int n){
            if(link[n] == n) return n;
            return link[n] = find(link[n]);
        }
        int same(int a, int b){
            return find(a) == find(b);
        }
        void unite(int a, int b){
            if(same(a, b)) return;
             
            a = find(a); b = find(b);
            if(saizu[a] < saizu[b]) swap(a, b);
             
            saizu[a] += saizu[b];
            link[b] = a;
        }
        int getsize(int a){
            return saizu[find(a)];
        }
};
 
const int mod = 1e9+7;
 
ll mode(ll a){
    a %= mod;
    if(a < 0) a += mod;
    return a;
}
 
ll subt(ll a, ll b){
    return mode(mode(a)-mode(b));
}
 
ll add(ll a, ll b){
    return mode(mode(a)+mode(b));
}
 
ll mult(ll a, ll b){
    return mode(mode(a)*mode(b));
}
 
ll binpow(ll a, ll b){
    ll res = 1;
    while(b){
        if(b&1) res = mult(res, a);
        a = mult(a, a);
        b >>= 1;
    }
    return res;
}
/*
struct point{
    double x, y;
    bool operator < (point other){
        if(x == other.x) return y < other.y;
        return x < other.x;
    }
};
struct line{
    double a, b, c;
};

double dot(point a, point b, point c){
    a.x -= c.x; b.x -= c.x;
    a.y -= c.y; b.y -= c.y;
    return a.x*b.y-b.x*a.y;
}

double det(double a, double b, double c, double d){
    return a*d-b*c;
}

bool intersect(line x, line y){
    double zn = det(x.a, x.b, y.a, y.b);
    if(abs(zn) < eps) return false;
    return true;
}

vector <point> hull;

void convex_hull(vector <point> v){
    int i;
    for(i = 0; i < sz(v); i++){
        hull.pb(v[i]);
        while(sz(hull) > 2){
            auto it = dot(hull[sz(hull)-2], hull.back(), hull[sz(hull)-3]);
            if(it > 0){
                auto to = hull.back();
                hull.pop_back();
                hull.pop_back();
                hull.pb(to);
            }
            else break;
        }
    }
    for(i = sz(v)-2; i >= 0; i--){
        hull.pb(v[i]);
        while(sz(hull) > 2){
            auto it = dot(hull[sz(hull)-2], hull.back(), hull[sz(hull)-3]);
            if(it > 0){
                auto to = hull.back();
                hull.pop_back();
                hull.pop_back();
                hull.pb(to);
            }
            else break;
        }
    }
}
*/

const int N = 5e5+7;
ll dp[N], pref[N];

int main(){
    do_not_disturb
    
    /*int n;
    cin >> n;
    vector <point> v(n);
    for(auto &to : v) cin >> to.x >> to.y;
    sort(all(v));
    convex_hull(v);
    
    int left = n-sz(hull);
    
    int ptmp = 3, etmp = 3;
    while(ptmp < n){
        ptmp++;
        etmp += 2;
    }
    */
    
    int n, i;
    cin >> n;
    
    for(i = 1; i <= n; i++){
        cin >> pref[i];
        pref[i] += pref[i-1];
    }
    
    int ind = 0;
    priority_queue <pair <ll, int>> K;
    K.push(mp(0, 0));
    
    for(i = 1; i <= n; i++){
        while(sz(K) && -K.top().first <= pref[i]-pref[K.top().second]){
            if(dp[ind] < dp[K.top().second] || (dp[ind] == dp[K.top().second] && ind < K.top().second))
                ind = K.top().second;
            K.pop();
        }
        dp[i] = dp[ind] + 1;
        K.push(mp(pref[ind]-pref[i], i));
    }
    
    cout << dp[n];
    
    return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27