Submission #532264

#	Time	Username	Problem	Language	Result	Execution time	Memory
532264		HaYoungJoon	Global Warming (CEOI18_glo)	C++14	0 / 100	563 ms	18744 KiB

glo

#include <bits/stdc++.h>
#define INF 1e9 + 7

using namespace std;

int n, X, a[200001], b[200001], res1[200001], res2[200001], L[200001];
map<int,int> mp;
vector<int> t;

void update(int v, int tl, int tr, int pos, int val) {
    if (tl == tr) {
        t[v] = val;
        return;
    }
    int tm = (tl + tr)/2;
    if (pos <= tm) update(2*v,tl,tm,pos,val);
    else update(2*v+1,tm+1,tr,pos,val);
    t[v] = max(t[2*v],t[2*v+1]);
}

int getMax(int v, int tl, int tr, int l, int r) {
    if (l > r) return -INF;
    if (tl > r || tr < l) return -INF;
    if (tl >= l && tr <= r) return t[v];
    int tm = (tl + tr)/2;
    return max(getMax(2*v,tl,tm,l,r),getMax(2*v+1,tm+1,tr,l,r));
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> X;
    vector<int> tmp;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        tmp.push_back(a[i]);
        tmp.push_back(a[i] - X);
    }
    sort(tmp.begin(),tmp.end());
    int cnt = 1;
    mp[tmp[0]] = 1;
    for (int i = 1; i < tmp.size(); i++) {
        if (tmp[i] != tmp[i-1]) cnt++;
        mp[tmp[i]] = cnt;
    }
    t.assign(4*cnt + 1,0);
    int lis = 0;
    for (int i = n; i >= 1; i--) {
        int pos = upper_bound(L,L + lis, -a[i]) - L;
        L[pos] = -a[i];
        res1[i] = pos + 1;
        update(1,1,n,mp[a[i]],res1[i]);
        lis = max(lis, pos + 1);
    }
    for (int i = 1; i <= n; i++) a[i] -= X;
    lis = 0;
    for (int i = 1; i <= n; i++) {
        int pos = upper_bound(L,L + lis, a[i]) - L;
        L[pos] = a[i];
        res2[i] = pos + 1;
        lis = max(lis, pos + 1);
    }
    int res = 0;
    for (int i = 1; i <= n; i++) {
        int cur = max(0,getMax(1,1,n, mp[a[i]] + 1, cnt));
        update(1,1,n,mp[a[i] + X], -INF);
        res = max(res,res2[i] + cur);
    }
    cout << res;
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:42:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for (int i = 1; i < tmp.size(); i++) {
      |                     ~~^~~~~~~~~~~~

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