Submission #282765

#	Time	Username	Problem	Language	Result	Execution time	Memory
282765		doowey	Global Warming (CEOI18_glo)	C++14	47 / 100	68 ms	8748 KiB

glo

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pii;

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

const ll inf = (ll)1e10;

int main(){
    fastIO;
    int n;
    ll x;
    cin >> n >> x;
    vector<ll> v(n);
    for(int i = 0 ; i < n; i ++ ){
        cin >> v[i];
    }
    vector<int> g;
    vector<pii> nx;
    int res = 1;
    int mid, l, r;
    int sh;
    for(int i = n-1; i >= 0 ; i -- ){
        sh = v[i];
        l = 0, r = (int)g.size();
        while(l < r){
            mid = (l + r) / 2;
            if(g[mid] <= sh)
                r = mid;
            else
                l = mid + 1;
        }
        if(l == g.size()){
            nx.push_back(mp(sh, -1));
            g.push_back(sh);
        }
        else{
            nx.push_back(mp(g[l], l));
            g[l]=sh;
        }
    }
    vector<int> cc;
    int nl, nr;
    int id;
    for(int i = 0 ; i < n; i ++ ){
        if(nx.back().se == -1){
            g.pop_back();
        }
        else{
            g[nx.back().se] = nx.back().fi;
        }
        nx.pop_back();
        sh = v[i]-x;
        l=0,r=cc.size();
        while(l < r){
            mid = (l + r) / 2;
            if(cc[mid] < sh)
                l = mid + 1;
            else
                r = mid;
        }
        id = l;
        if(id == cc.size()){
            cc.push_back(sh);
        }
        else{
            cc[id] = sh;
        }
        l = 0, r = g.size();
        while(l + 1 < r){
            mid = (l + r) / 2;
            if(g[mid] > sh)
                l = mid;
            else
                r = mid;
        }
        res = max(res, (id+1)+l+(g[l]>sh));
    }
    cout << res << "\n";
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:39:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |         if(l == g.size()){
      |            ~~^~~~~~~~~~~
glo.cpp:69:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |         if(id == cc.size()){
      |            ~~~^~~~~~~~~~~~
glo.cpp:49:9: warning: unused variable 'nl' [-Wunused-variable]
   49 |     int nl, nr;
      |         ^~
glo.cpp:49:13: warning: unused variable 'nr' [-Wunused-variable]
   49 |     int nl, nr;
      |             ^~

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