Submission #1332516

#	Time	Username	Problem	Language	Result	Execution time	Memory
1332516		retarde	Exhibition (JOI19_ho_t2)	C++20	100 / 100	157 ms	26264 KiB

joi2019_ho_t2

#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define int long long
#define all(x) (x).begin(), (x).end()

typedef long double ld;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<bool>> vvb;
typedef vector<vector<ll>> vvll;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<char> vc;
typedef vector<vector<char>> vvc;
typedef map<int, int> mii;
typedef unordered_map<int, int> umii;

const int mod = 1e9 + 7;
const int inf = INTMAX_MAX;
const bool tc = false;

inline void solve() {
    int n, m;
    cin >> n >> m;
    vector<pii> fl(n); // {v, s}
    for (int i = 0; i < n; i++) cin >> fl[i].se >> fl[i].fi;
    sort(all(fl));
    vi p(m); for (int i = 0; i < m; i++) cin >> p[i];
    sort(all(p));

    vector<pii> fl2; for (auto &x : fl) if (x.se <= p[m - 1]) fl2.pb(x);
    fl = fl2; n = fl2.size();

    map<int, vi> pos; set<int> active;
    for (int i = 0; i < n; i++) {pos[fl2[i].se].pb(i); active.insert(i);}

    vector<pair<int, vi>> pos2; for (auto &x : pos) pos2.pb(x); // {thing, vector of positions}

    int ans = 0; int rt = n - 1; int ptr = pos2.size() - 1;
    for (int i = m - 1; i >= 0; i--) {
        int x = p[i]; // painting size
        // deactivate anything unusable
        while (ptr >= 0) {
            if (pos2[ptr].fi <= x) break;
            for (auto &x : pos2[ptr].se) active.erase(x);
            ptr--;
        }

        // deactivate anything from this
        // for (auto &y : pos[x]) active.erase(y);
        if (!active.size()) break;
        active.erase(*active.rbegin());
        ans++;
    }
    cout << ans << '\n';
}

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

signed main() {
    ios::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);
    //setIO();

    int t = 1;
    if (tc) {
        cin >> t;
    }

    while (t--) {
        solve();
    }
}

Compilation message (stderr)

joi2019_ho_t2.cpp: In function 'void setIO(std::string)':
joi2019_ho_t2.cpp:70:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t2.cpp:71:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 50 / 50