oj.uz

Submission #57093

# Submission time Handle Problem Language Result Execution time Memory
57093 2018-07-14T01:38:19 Z Benq Money (IZhO17_money) C++14
0 / 100
 3 ms 624 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;

template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define F0R(i, a) for (int i=0; i<(a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)

#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

const int MOD = 1000000007;
const ll INF = 1e18;
const int MX = 100001;

Tree<int> T;
int n;

bool nex(int a, int b) {
    auto it = next(T.find(a));
    if (it != T.end() && *it == b) return 1;
    return 0;
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n;
    FOR(i,1,n+1) T.insert(i);
    vi v(n); F0R(i,n) cin >> v[i];
    int ans = 0;
    while (sz(v)) {
        while (sz(v) > 1 && nex(v[sz(v)-2],v[sz(v)-1])) {
            T.erase(v.back()); v.pop_back();
        }
        T.erase(v.back()); v.pop_back(); ans ++;
    }
    cout << ans;
}

/* Look for:
* the exact constraints (multiple sets are too slow for n=10^6 :( ) 
* special cases (n=1?)
* overflow (ll vs int?)
* array bounds
*/

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 408 KB Output is correct
2 Correct 3 ms 624 KB Output is correct
3 Correct 3 ms 624 KB Output is correct
4 Incorrect 2 ms 624 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 408 KB Output is correct
2 Correct 3 ms 624 KB Output is correct
3 Correct 3 ms 624 KB Output is correct
4 Incorrect 2 ms 624 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 408 KB Output is correct
2 Correct 3 ms 624 KB Output is correct
3 Correct 3 ms 624 KB Output is correct
4 Incorrect 2 ms 624 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 55.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 408 KB Output is correct
2 Correct 3 ms 624 KB Output is correct
3 Correct 3 ms 624 KB Output is correct
4 Incorrect 2 ms 624 KB Output isn't correct
5 Halted 0 ms 0 KB -