Submission #671522

#	Time	Username	Problem	Language	Result	Execution time	Memory
671522		Alihan_8	Money (IZhO17_money)	C++17	100 / 100	1050 ms	61940 KiB

money

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make_pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define int long long
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n; cin >> n;
    vector <int> p(n);
    for ( auto &i: p ) cin >> i;
    int cnt = 0;
    const int inf = numeric_limits <int>::max();
    set <int> st{-inf, inf};
    for ( int i = 0; i < n;){
        auto l = st.lower_bound(p[i]); l--;
        auto r = st.upper_bound(p[i]);
        int j = i;
        while ( j < n and *l <= p[j] and *r >= p[j] ){
            if ( j > i and p[j] < p[j-1] ) break;
            j++;
        } j--;
        cnt++;
        for ( int k = i; k <= j; k++ ) st.insert(p[k]);
        i = j+1;
    }
    cout << cnt;

    cout << '\n';
}

Compilation message (stderr)

money.cpp: In function 'void IO(std::string)':
money.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
money.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55