Submission #1067684

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067684		CodeLakVN	Global Warming (CEOI18_glo)	C++17	45 / 100	43 ms	5516 KiB

glo

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define name "LIS"
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FOD(i, b, a) for (int i = (b); i >= (a); i--)

template <class U, class V>
    bool maximize(U &x, V y) {
        if (x < y) { x = y; return true; }
        return false;
    }

template <class U, class V>
    bool minimize(U &x, V y) {
        if (x > y) { x = y; return true; }
        return false;
    }

const int INF = 1e9;
const int N = 3e5 + 5;

int a[N];

int main() {
    ios_base::sync_with_stdio(NULL);
    cin.tie(0); cout.tie(0);
    if (fopen(name".inp", "r")) {
        freopen(name".inp", "r", stdin);
        freopen(name".out", "w", stdout);
    }

    int n, d;
    cin >> n >> d;
    FOR(i, 1, n) cin >> a[i];

    vector<int> f(n + 1, 0); f[0] = INF;
    vector<int> suff(n + 1, 0);

    int ans = 0;
    FOD(i, n, 1) {
        int idx = lower_bound(f.begin(), f.end(), a[i], greater<int>()) - f.begin();
        suff[i] = idx;
        f[idx] = a[i];
        maximize(ans, idx);
    }

    f = vector<int>(n + 1, INF); f[0] = 0;
    FOR(i, 1, n - 1) {
        int idx = lower_bound(f.begin(), f.end(), a[i]) - f.begin();
        f[idx] = a[i];
        idx = lower_bound(f.begin(), f.end(), a[i + 1] + d) - f.begin();
        maximize(ans, idx + suff[i + 1] - 1);
    }

    cout << ans;

    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen(name".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:33:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |         freopen(name".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25