Submission #956064

#	Time	Username	Problem	Language	Result	Execution time	Memory
956064		Neco_arc	Bigger segments (IZhO19_segments)	C++17	0 / 100	2 ms	2396 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) 2e5 + 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];
pair<int, ll> dp[maxn];

pair<int, ll> cb(pair<int, ll> x, pair<int, ll> y) {
    if(x.first > y.first) return x;
    if(x.first == y.first && x.second < y.second) return x;
    return y;
}

bool check(){
    ll pre = 0;
    fi(i, 1, n) {
        ll val = dp[i].first + dp[i].second;
        if(val < pre) return 0;
        pre = val;
    }
    return 1;
}

void solve()
{

    cin >> n;
    fi(i, 1, n) cin >> a[i];

    fi(i, 1, n) {
        ll S = 0;
        fid(j, i, 1)
        {
            S += a[j];
            if(S >= dp[j - 1].second) dp[i] = cb(dp[i], {dp[j - 1].first + 1, S});
        }
    }

    if(check()) 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;
}

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(Neco".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(Neco".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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