Submission #868946

#	Time	Username	Problem	Language	Result	Execution time	Memory
868946		quandlm	Global Warming (CEOI18_glo)	C++14	27 / 100	228 ms	18420 KiB

glo

#include <bits/stdc++.h>
#define file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }
#define ll long long
#define FOR(i, a, b) for (int i = (a); i <= (b); ++i)
#define REP(i, a, b) for (int i = (a); i >= (b); --i)
#define pi pair<int,int>
#define ple tuple<int,int,int>
#define fi first
#define se second
#define ii make_pair
#define isz(a) ((int)a.size())
#define ALL(a) a.begin(), a.end()

using namespace std;

const int N = 1e6 + 10;

int n, x, pref[N], suf[N];
int cnt = 0, a[N], b[N];
vector<int> values;


int node[N * 4];
void reset() {
    FOR(i,1,4*cnt) {
        node[i]=0;
    }
}
void update (int id, int l, int r, int u, int val) {
    if (l == r) {
        node[id] = max(node[id], val);
        return;
    }
    int mid = l + r >> 1;
    if (u <= mid) update(id*2, l, mid, u, val);
    else update(id*2+1, mid+1, r, u, val);
    node[id] = max(node[id*2], node[id*2+1]);
}
int get (int id, int l, int r, int u, int v) {
    if (l > v || r < u || l > r || u > v) return 0;
    if (l >= u && r <= v) return node[id];
    int mid = l + r >> 1;
    return max(get(id*2,l,mid,u,v),get(id*2+1,mid+1,r,u,v));
}

void update (int u, int val) {
    update(1,1,cnt,u,val);
}

int get (int l, int r) {
    return get(1,1,cnt,l,r);
}

int main () {
    file("dynamic");
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n >> x;
    FOR(i,1,n) cin >> a[i];
    FOR(i,1,n) {
        values.push_back(a[i]);
        values.push_back(a[i]+x);
    }
    sort(ALL(values));
    values.resize(unique(ALL(values))-values.begin());
    cnt = isz(values);
    FOR(i,1,n) {
        a[i]=lower_bound(ALL(values),a[i])-values.begin()+1;
        b[i]=a[i]+x;
        b[i]=lower_bound(ALL(values),b[i])-values.begin()+1;
    }
    REP(i,n,1) {
        suf[i] = get(a[i]+1, cnt) + 1;
        update(a[i], suf[i]);
    }
    reset();
    int res = 0;
    FOR(i,1,n) {
        pref[i] = get(1, a[i] - 1) + 1;
        update(a[i], pref[i]);
        res = max(res, pref[i]);
        res = max(res, get(1,b[i]-1) + suf[i]);
    }
    cout << res << '\n';
}

Compilation message (stderr)

glo.cpp: In function 'void update(int, int, int, int, int)':
glo.cpp:34:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   34 |     int mid = l + r >> 1;
      |               ~~^~~
glo.cpp: In function 'int get(int, int, int, int, int)':
glo.cpp:42:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   42 |     int mid = l + r >> 1;
      |               ~~^~~
glo.cpp: In function 'int main()':
glo.cpp:2:60: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }
      |                                                    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:55:5: note: in expansion of macro 'file'
   55 |     file("dynamic");
      |     ^~~~
glo.cpp:2:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }
      |                                                                                      ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:55:5: note: in expansion of macro 'file'
   55 |     file("dynamic");
      |     ^~~~

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