Submission #358608

#	Time	Username	Problem	Language	Result	Execution time	Memory
358608		sumit_kk10	Global Warming (CEOI18_glo)	C++14	10 / 100	62 ms	5220 KiB

glo

#include <bits/stdc++.h>
#define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL)
using namespace std;
const long long int N = 1e6 + 5;
const long long int MOD = 1e9 + 7;

int main(){
    fast;
    long long int n, x;
    cin >> n >> x;
    long long int a[n];
    for(long long int i = 0; i < n; ++i)
        cin >> a[i];    
    vector<pair<long long int, long long int> > lis;
    lis.push_back({a[0], 0});
    for(long long int i = 1; i < n; ++i){
        if(a[i] > lis.back().first){
            lis.push_back({a[i], i});
            continue;
        }
        long long int low = 0, high = lis.size() - 1, ans = -1;
        while(low <= high){
            long long int mid = (low + high) / 2;
            if(lis[mid].first >= a[i]){
                ans = mid;
                high = mid - 1;
            }
            else
                low = mid + 1;
        }
        if(ans == -1)
            continue;
        lis[ans] = {a[i], i};
    }
    long long int mx = lis.size(), l = INT_MAX, r = 0;
    for(auto k : lis){
        l = min(l, k.second);
        r = max(r, k.second);
    }
    for(long long int i = l; i <= r; ++i)
        a[i] += x;
    vector<long long int> lis1;
    lis1.push_back(a[0]);
    for(long long int i = 1; i < n; ++i){
        if(a[i] > lis1.back()){
            lis1.push_back(a[i]);
            continue;
        }
        long long int low = 0, high = lis1.size() - 1, ans = -1;
        while(low <= high){
            long long int mid = (low + high) / 2;
            if(lis1[mid] >= a[i]){
                ans = mid;
                high = mid - 1;
            }
            else
                low = mid + 1;
        }
        if(ans == -1)
            continue;
        lis1[ans] = a[i];
    }
    mx = max(mx, (long long int) lis1.size());
    for(long long int i = l; i <= r; ++i)
        a[i] -= 2*x;
    lis1.clear();
    lis1.push_back(a[0]);
    for(long long int i = 1; i < n; ++i){
        if(a[i] > lis1.back()){
            lis1.push_back(a[i]);
            continue;
        }
        long long int low = 0, high = lis1.size() - 1, ans = -1;
        while(low <= high){
            long long int mid = (low + high) / 2;
            if(lis1[mid] >= a[i]){
                ans = mid;
                high = mid - 1;
            }
            else
                low = mid + 1;
        }
        if(ans == -1)
            continue;
        lis1[ans] = a[i];
    }
    cout << max(mx, (long long int) lis1.size()) << '\n';
    return 0;
}

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