Submission #741237

#	Time	Username	Problem	Language	Result	Execution time	Memory
741237		blackslex	Global Warming (CEOI18_glo)	C++17	100 / 100	63 ms	7696 KiB

glo

#include<bits/stdc++.h>

using namespace std;
using ll = long long;

const int N = 2e5 + 5;
ll n, k, a[N], b[N], ans;
vector<ll> v, u;

int main() {
    scanf("%lld %lld", &n, &k);
    for (int i = 1; i <= n; i++) scanf("%lld", &a[i]);
    for (int i = 1; i <= n; i++) {
        auto lower = lower_bound(v.begin(), v.end(), a[i]);
        if (lower == v.end()) v.emplace_back(a[i]), b[i] = v.size();
        else *lower = a[i], b[i] = lower - v.begin() + 1;
    }
    for (int i = n; i >= 1; i--) {
        ll idx = lower_bound(u.begin(), u.end(), -a[i] + k) - u.begin();
        ans = max(ans, b[i] + idx);
        auto lower = lower_bound(u.begin(), u.end(), -a[i]);
        if (lower == u.end()) u.emplace_back(-a[i]);
        else *lower = -a[i];
    }
    printf("%lld", ans);
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     scanf("%lld %lld", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~
glo.cpp:12:39: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     for (int i = 1; i <= n; i++) scanf("%lld", &a[i]);
      |                                  ~~~~~^~~~~~~~~~~~~~~

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