Submission #1071699

#	Time	Username	Problem	Language	Result	Execution time	Memory
1071699		steveonalex	Divide and conquer (IZhO14_divide)	C++17	100 / 100	46 ms	6608 KiB

divide

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
#define block_of_code if(true)
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll gcd(ll a, ll b){return __gcd(a, b);}
ll lcm(ll a, ll b){return a / gcd(a, b) * b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
double rngesus_d(double l, double r){
    double cur = rngesus(0, MASK(60) - 1);
    cur /= MASK(60) - 1;
    return l + cur * (r - l);
}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

const int N = 1e5 + 69;
const ll INF = 1e18 + 69;
int n;
int x[N], g[N], d[N];
ll actual[N];

struct FenwickTree{
    int n;
    vector<ll> a;

    FenwickTree(int _n){
        n = _n;
        a.resize(n+1, INF);
    }

    void update(int i, ll v){
        while(i <= n){
            minimize(a[i], v);
            i += LASTBIT(i);
        }
    }

    ll get(int i){
        ll ans = INF;
        while(i > 0){
            minimize(ans, a[i]);
            i -= LASTBIT(i);
        }
        return ans;
    }
};

int main(void){
    ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
    clock_t start = clock();

    cin >> n;
    for(int i = 0; i<n; ++i) cin >> x[i] >> g[i] >> d[i];

    ll sum = 0;
    vector<int> b;
    for(int i = 0; i<n; ++i) {
        actual[i] = sum - x[i];
        sum += d[i];
        b.push_back(actual[i]);
    }

    remove_dup(b);

    FenwickTree bit(b.size());
    sum = 0;
    ll sum_g = 0, ans = 0;
    for(int i = 0; i<n; ++i){
        int idx = lower_bound(ALL(b), actual[i]) - b.begin() + 1;
        bit.update(idx, sum_g);

        sum += d[i];
        sum_g += g[i];

        ll cur = sum - x[i];
        idx = upper_bound(ALL(b), cur) - b.begin();

        maximize(ans, sum_g - bit.get(idx));
    }
    cout << ans << "\n";

 
    cerr << "Time elapsed: " << clock() - start << " ms\n";
    return 0;
}

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52