Submission #469446

#	Time	Username	Problem	Language	Result	Execution time	Memory
469446		dooompy	Global Warming (CEOI18_glo)	C++17	100 / 100	58 ms	4300 KiB

glo

#include "bits/stdc++.h"

using namespace std;

using ll = long long;

int dp[200050];

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
//    freopen("", "r", stdin);
//    freopen("", "w", stdout);
    int n, x; cin >> n >> x;
    vector<int> v(n);
    for (auto &a : v) cin >> a;

    int ans = 0;

    vector<int> lis;
    for (int i = 0; i < n; i++) {
        int pos = lower_bound(lis.begin(), lis.end(), v[i]) - lis.begin();
        if (pos == lis.size()) {
            lis.push_back(v[i]);
        } else {
            lis[pos] = v[i];
        }
        dp[i] = pos + 1;
        ans = max(ans, dp[i]);
    }

    lis.clear();
    for (int i = n-1; i >= 0; i--) {
        int anspos = lower_bound(lis.begin(), lis.end(), -v[i] + x) - lis.begin();
        ans = max(ans, dp[i] + anspos);
        int pos = lower_bound(lis.begin(), lis.end(), -v[i]) - lis.begin();
        if (pos == lis.size()) {
            lis.push_back(-v[i]);
        } else {
            lis[pos] = -v[i];
        }
    }


    cout << ans;

}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:23:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         if (pos == lis.size()) {
      |             ~~~~^~~~~~~~~~~~~
glo.cpp:37:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         if (pos == lis.size()) {
      |             ~~~~^~~~~~~~~~~~~

• 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