제출 #956065

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
956065		Neco_arc	Bigger segments (IZhO19_segments)	C++17	100 / 100	105 ms	28756 KiB

segments

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define all(x) x.begin(), x.end()
#define Neco "Bigger segments"
#define resp(x) sort(all(x)), x.resize(unique(all(x)) - x.begin())
#define getbit(x,i) ((x >> i)&1)
#define _left id * 2, l, mid
#define _right id * 2 + 1, mid + 1, r
#define cntbit(x) __builtin_popcountll(x)
#define fi(i, a, b) for(int i = a; i <= b; i++)
#define fid(i, a, b) for(int i = a; i >= b; i--)
#define maxn (int) 5e5 + 7

using namespace std;

const ll mod = 1e9 + 7; //972663749
const ll base = 911382323;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

ll GetRandom(ll l, ll r)
{
    return uniform_int_distribution<ll> (l, r)(rng);
}

int n;
ll a[maxn], s[maxn];
pair<int, ll> dp[maxn];
pair<int, ll> bit[maxn];

void update(int x, pair<int, ll> val) {
    while(x < maxn) bit[x] = max(bit[x], val), x += (x & -x);
}

pair<int, ll> get(int x, pair<int, ll> ans = {0, 0}) {
    while(x > 0) ans = max(ans, bit[x]), x -= (x & -x);
    return ans;
}

void solve()
{

    cin >> n;
    fi(i, 1, n) cin >> a[i], s[i] = s[i - 1] + a[i];

    fi(i, 1, n) {
        pair<int, ll> val = get(i);
        dp[i] = {val.first + 1, s[i] - val.second};

        int vt = lower_bound(s + 1, s + 1 + n, s[i] + dp[i].second) - s;
        update(vt, {val.first + 1, s[i]});
    }

    cout << dp[n].first;


}


int main()
{

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    if(fopen(Neco".inp", "r")) {
        freopen(Neco".inp", "r", stdin);
        freopen(Neco".out", "w", stdout);
    }


    int nTest = 1;
//    cin >> nTest;


    while(nTest--)
    {
        solve();
    }


    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

segments.cpp: In function 'int main()':
segments.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen(Neco".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen(Neco".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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