oj.uz

Submission #175807

# Submission time Handle Problem Language Result Execution time Memory
175807 2020-01-07T11:19:18 Z 43V3R Bigger segments (IZhO19_segments) C++14
0 / 100
 2 ms 376 KB 
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
 
#pragma GCC optimize("-O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
 
#define fi first
#define se second
#define p_b push_back
#define pll pair<ll,ll>
#define pii pair<int,int>
#define m_p make_pair
#define all(x) x.begin(),x.end()
#define sset ordered_set
#define sqr(x) (x)*(x)
#define pw(x) (1ll << x)
 
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
const ll MAXN = 1123456;
const ll N = 2e5;
mt19937_64 rnd(chrono::system_clock::now().time_since_epoch().count());
 
template <typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
template <typename T> void vout(T s){cout << s << endl;exit(0);}
 
ll v[MAXN];
 
int main(){
    ios_base :: sync_with_stdio(0);
    cin.tie(0);
 
    ll n;
    cin >> n;
 
    vector <ll> a(n + 1), pref(n + 1);
    vector <pll> dp(n + 1);
 
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        pref[i] = pref[i - 1] + a[i];
    }
 
    dp[0] = {0, 0};
    ll uk = 0;
 
    ll mx = 0;
 
    for(int i = 1; i <= n; i++){
        mx = max(mx, v[i]);
        dp[i] = {pref[i] - pref[mx], dp[mx].se + 1};
 
            ll l = i + 1, r = n;
            while(l < r){
                ll c = (l + r) >> 1;
                if(pref[c] - pref[i] < dp[i].fi)l = c + 1; else r = c;
            }
            v[l] = max(v[l], ll(i));
 
    }
 
    cout << dp[n].se << "\n";
 
    return 0;
}

Compilation message

segments.cpp: In function 'int main()':
segments.cpp:51:8: warning: unused variable 'uk' [-Wunused-variable]
     ll uk = 0;
        ^~

Subtask #1
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Incorrect 2 ms 376 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Incorrect 2 ms 376 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Incorrect 2 ms 376 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Incorrect 2 ms 376 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Incorrect 2 ms 376 KB Output isn't correct
5 Halted 0 ms 0 KB -