Submission #819221

#	Time	Username	Problem	Language	Result	Execution time	Memory
819221		TS_2392	Global Warming (CEOI18_glo)	C++14	100 / 100	51 ms	4232 KiB

glo

#include <bits/stdc++.h>
#define pb push_back
#define lwb lower_bound
#define all(x) (x).begin(), (x).end()
using namespace std;
const int N = 2e5 + 3;
int n, x, res, dp[N], a[N];
vector<int> lis;
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    cin >> n >> x;
    for(int i = 1; i <= n; ++i){
        cin >> a[i];
        int j = lwb(all(lis), a[i]) - lis.begin();
        dp[i] = j + 1;
        if(j == lis.size()) lis.pb(a[i]);
        else lis[j] = a[i];
    }
    lis.clear();
    for(int i = n; i >= 1; --i){
        int j = lwb(all(lis), -a[i]) - lis.begin();
        res = max(res, dp[i] + j);
        j = lwb(all(lis), -a[i] - x) - lis.begin();
        if(j == lis.size()) lis.pb(-a[i]- x);
        else lis[j] = -a[i] - x;
    }
    cout << res;
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:17:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |         if(j == lis.size()) lis.pb(a[i]);
      |            ~~^~~~~~~~~~~~~
glo.cpp:25:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         if(j == lis.size()) lis.pb(-a[i]- x);
      |            ~~^~~~~~~~~~~~~

• 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