Submission #741578

#	Time	Username	Problem	Language	Result	Execution time	Memory
741578		maomao90	Advertisement 2 (JOI23_ho_t2)	C++17	100 / 100	338 ms	32972 KiB

Main

// Hallelujah, praise the one who set me free
// Hallelujah, death has lost its grip on me
// You have broken every chain, There's salvation in your name
// Jesus Christ, my living hope
#include <bits/stdc++.h> 
using namespace std;

#define REP(i, s, e) for (int i = (s); i < (e); i++)
#define RREP(i, s, e) for (int i = (s); i >= (e); i--)
template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
typedef long long ll;
typedef long double ld;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define SZ(_a) (int) _a.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<iii> viii;

#ifndef DEBUG
#define cerr if (0) cerr
#endif

const int INF = 2000000005;
const ll LINF = 1000000000000000005ll;
const int MAXN = 500005;

int n;
ii xe[MAXN];
int inv[MAXN];
vii ord;
int ans;

#define MLR int mid = lo + hi >> 1, lc = u << 1, rc = u << 1 ^ 1
int sub[MAXN * 4], add[MAXN * 4];
void upd(int p, int s, int a, int u = 1, int lo = 1, int hi = n) {
    if (lo == hi) {
        mxto(sub[u], s);
        mxto(add[u], a);
        return;
    }
    MLR;
    if (p <= mid) {
        upd(p, s, a, lc, lo, mid);
    } else {
        upd(p, s, a, rc, mid + 1, hi);
    }
    sub[u] = max(sub[lc], sub[rc]);
    add[u] = max(add[lc], add[rc]);
    cerr << u << ' ' << lo << ' ' << hi << ": " << sub[u] << '\n';
}
int qsub(int s, int e, int u = 1, int lo = 1, int hi = n) {
    if (lo >= s && hi <= e) {
        return sub[u];
    }
    MLR;
    int mx = -INF;
    if (s <= mid) {
        mxto(mx, qsub(s, e, lc, lo, mid));
    }
    if (e > mid) {
        mxto(mx, qsub(s, e, rc, mid + 1, hi));
    }
    return mx;
}
int qadd(int s, int e, int u = 1, int lo = 1, int hi = n) {
    if (lo >= s && hi <= e) {
        return add[u];
    }
    MLR;
    int mx = -INF;
    if (s <= mid) {
        mxto(mx, qadd(s, e, lc, lo, mid));
    }
    if (e > mid) {
        mxto(mx, qadd(s, e, rc, mid + 1, hi));
    }
    return mx;
}

int main() {
#ifndef DEBUG
    ios::sync_with_stdio(0), cin.tie(0);
#endif
    cin >> n;
    REP (i, 0, n) {
        cin >> xe[i].FI >> xe[i].SE;
    }
    sort(xe, xe + n);
    REP (i, 0, n) {
        ord.pb({xe[i].SE, i});
    }
    int prv = -1, ptr = 0;
    REP (i, 0, n) {
        if (xe[i].FI != prv) {
            prv = xe[i].FI;
            ptr++;
        }
        inv[ptr] = xe[i].FI;
        xe[i].FI = ptr;
    }
    sort(ALL(ord), greater<ii>());
    REP (i, 0, 4 * MAXN) {
        add[i] = sub[i] = -INF;
    }
    for (auto [_, i] : ord) {
        auto [x, e] = xe[i];
        cerr << x << ' ' << e << ' ' << inv[x] << '\n';
        cerr << " ? " << e - inv[x] << ' ' << e + inv[x] << '\n';
        int sub = qsub(x, n);
        cerr << ' ' << sub << '\n';
        if (sub >= e - inv[x]) {
            continue;
        }
        int add = qadd(1, x);
        cerr << ' ' << add << '\n';
        if (add >= e + inv[x]) {
            continue;
        }
        cerr << " ! " << x << ' ' << e - inv[x] << ' ' << e + inv[x] << '\n';
        upd(x, e - inv[x], e + inv[x]);
        ans++;
    }
    cout << ans << '\n';
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void upd(int, int, int, int, int, int)':
Main.cpp:44:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   44 | #define MLR int mid = lo + hi >> 1, lc = u << 1, rc = u << 1 ^ 1
      |                       ~~~^~~~
Main.cpp:52:5: note: in expansion of macro 'MLR'
   52 |     MLR;
      |     ^~~
Main.cpp: In function 'int qsub(int, int, int, int, int)':
Main.cpp:44:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   44 | #define MLR int mid = lo + hi >> 1, lc = u << 1, rc = u << 1 ^ 1
      |                       ~~~^~~~
Main.cpp:66:5: note: in expansion of macro 'MLR'
   66 |     MLR;
      |     ^~~
Main.cpp: In function 'int qadd(int, int, int, int, int)':
Main.cpp:44:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   44 | #define MLR int mid = lo + hi >> 1, lc = u << 1, rc = u << 1 ^ 1
      |                       ~~~^~~~
Main.cpp:80:5: note: in expansion of macro 'MLR'
   80 |     MLR;
      |     ^~~

• Subtask 1: 10 / 10
• Subtask 2: 23 / 23
• Subtask 3: 36 / 36
• Subtask 4: 31 / 31