Submission #955256

#	Time	Username	Problem	Language	Result	Execution time	Memory
955256		Github	Global Warming (CEOI18_glo)	C++17	100 / 100	49 ms	4808 KiB

glo

#include <iostream>
#include <vector>
#include <queue>
#include <cstring>
#include <map>
#include <climits>
#include <cmath>
#include <algorithm>
#include <stack>
#include <set>
using namespace std;

#define speedup ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#define ll long long
#define pr printf
#define sc scanf
#define fi first
#define si second

const ll MOD = 1e9+7;
const ll INF = 1e17;

void setIO(string s){
    freopen((s+".in").c_str(), "r", stdin);
    freopen((s+".out").c_str(), "w", stdout);
}


int find_lis(vector<int> a){
    vector<int> dp;
    for (int i: a){
        int pos = lower_bound(dp.begin(), dp.end(), i)-dp.begin();
        if (pos == dp.size()){
            dp.push_back(i);
        }else{
            dp[pos] = i;
        }
    }
    return dp.size();
}


int main() {
    speedup
    int n, d; cin >> n >> d;
    vector<int> a(n);
    for (int i = 0; i < n; i++){
        cin >> a[i];
    }
    vector<int> pref(n);
    vector<int> dp;
    for (int i = 0; i < n; i++){
        int pos = lower_bound(dp.begin(), dp.end(), a[i])-dp.begin();
        pref[i] = pos+1;
        if (pos == dp.size()){
            dp.push_back(a[i]);
        }else{
            dp[pos] = a[i];
        }
    }
    int ans = dp.size();
    dp.clear();
    for (int i = n-1; i >= 0; i--){
        int pos = lower_bound(dp.begin(), dp.end(), -a[i]+d) - dp.begin();
        ans = max(pref[i]+pos, ans);
        pos = lower_bound(dp.begin(), dp.end(), -a[i]) - dp.begin();
        if (pos == dp.size()){
            dp.push_back(-a[i]);
        }else{
            dp[pos] = -a[i];
        }
    }
    cout << ans << endl;
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int find_lis(std::vector<int>)':
glo.cpp:33:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         if (pos == dp.size()){
      |             ~~~~^~~~~~~~~~~~
glo.cpp: In function 'int main()':
glo.cpp:55:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         if (pos == dp.size()){
      |             ~~~~^~~~~~~~~~~~
glo.cpp:67:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |         if (pos == dp.size()){
      |             ~~~~^~~~~~~~~~~~
glo.cpp: In function 'void setIO(std::string)':
glo.cpp:24:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |     freopen((s+".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:25:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |     freopen((s+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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