Submission #519932

#	Time	Username	Problem	Language	Result	Execution time	Memory
519932		idas	Global Warming (CEOI18_glo)	C++11	62 / 100	385 ms	51700 KiB

glo

#include <bits/stdc++.h>
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define f first
#define s second
#define pb push_back
#define sz(x) ((int)((x).size()))
#define le(vec) vec[vec.size()-1]
#define all(x) (x).begin(), (x).end()
#define TSTS int ttt; cin >> ttt; while(ttt--) solve()

using namespace std;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long double, long double> pdd;
typedef map<int, int> mii;
typedef vector<int> vi;
typedef long double ld;
typedef long long ll;

const int INF=1e9, MOD=1e9+7, mod=998244353;
const ll LINF=1e18;

void setIO()
{
    FAST_IO;
}

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

const int N=2e5+10;
int n, xx, a[N], d[N], nd[N], t[4*N], idx;
multiset<int, greater<int>> vals[N];
set<int> st;
mii c, rec;

void build(int l=1, int r=idx, int id=1)
{
    assert(l<=r);
    if(l==r){
        t[id]=*vals[l].begin();
        return;
    }
    int m=(l+r)/2;
    build(l, m, id*2);
    build(m+1, r, id*2+1);
    t[id]=max(t[id*2], t[id*2+1]);
}

void rem(int p, int x, int l=1, int r=idx, int id=1)
{
    assert(l<=r);
    if(l==r){
        vals[p].erase(vals[p].find(x));
        if(vals[p].empty()) st.erase(rec[p]);
        t[id]=*vals[p].begin();
        return;
    }
    int m=(l+r)/2;
    if(p<=m) rem(p, x, l, m, id*2);
    else rem(p, x, m+1, r, id*2+1);
    t[id]=max(t[id*2], t[id*2+1]);
}

int get(int x, int y, int l=1, int r=idx, int id=1)
{
    if(x>r||y<l) return 0;
    if(x<=l&&r<=y) return t[id];
    int m=(l+r)/2;
    return max(
        get(x, y, l, m, id*2),
        get(x, y, m+1, r, id*2+1)
    );
}

int main()
{
    setIO();
    cin >> n >> xx;
    FOR(i, 0, n) cin >> a[i], st.insert(a[i]);

    for(auto x : st) c[x]=++idx, rec[idx]=x;

    vi lds;
    for(int i=n-1; i>=0; i--){
        int l=0, r=sz(lds);
        while(l<r){
            int m=(l+r)/2;
            if(lds[m]>a[i]) l=m+1;
            else r=m;
        }
        if(l==sz(lds)) lds.pb(a[i]);
        else lds[l]=a[i];

        d[i]=sz(lds);
        nd[i]=le(lds);
        vals[c[nd[i]]].insert(d[i]);
    }

    FOR(i, 1, idx+1) if(vals[i].empty()) st.erase(rec[i]);

    build();

    vi lis; int ans=sz(lds);
    FOR(i, 0, n)
    {
        rem(c[nd[i]], d[i]);

        a[i]-=xx;
        int in=lower_bound(all(lis), a[i])-lis.begin();
        if(in==sz(lis)) lis.pb(a[i]);
        else lis[in]=a[i];

        int lst=le(lis), mx=0;
        if(st.upper_bound(lst)!=st.end())
        mx=get(c[*st.upper_bound(lst)], idx);
        ans=max(ans, mx+sz(lis));
    }

    cout << ans;
}

Compilation message (stderr)

glo.cpp: In function 'void setIO(std::string)':
glo.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen((s+".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:34:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |     freopen((s+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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