Submission #676283

#	Time	Username	Problem	Language	Result	Execution time	Memory
676283		Do_you_copy	Exhibition (JOI19_ho_t2)	C++17	100 / 100	49 ms	2352 KiB

joi2019_ho_t2

//Then
#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
#define faster ios_base::sync_with_stdio(0); cin.tie(0);

using namespace std;
using ll = long long;
using ld = long double;
using pii = pair <int, int>;
mt19937_64 Rand(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e5 + 1;
//const int Mod = 1e9 + 7;
//const int inf =
int n, m;
pii a[maxN];
int c[maxN];
void Init(){
    cin >> n >> m;
    for (int i = 1; i <= n; ++i){
        cin >> a[i].fi >> a[i].se;
        swap(a[i].fi, a[i].se);
    }
    for (int i = 1; i <= m; ++i) cin >> c[i];
    sort(c + 1, c + m + 1);
    sort(a + 1, a + n + 1);
    int j = n;
    int ans = 0;
    for (int i = m; i >= 1; --i){
        while (j > 0 && a[j].se > c[i]) --j;
        if (j == 0) break;
        ++ans;
        --j;
    }
    cout << ans;
}

#define debug
#define taskname "test"
signed main(){
    faster
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    int tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        timeout << signed(double(clock()) / CLOCKS_PER_SEC * 1000);
        timeout.close();
        #ifndef debug
        cerr << "Time elapsed: " << signed(double(clock()) / CLOCKS_PER_SEC * 1000) << "ms\n";
        #endif // debug
    }
}

Compilation message (stderr)

joi2019_ho_t2.cpp: In function 'int main()':
joi2019_ho_t2.cpp:44:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t2.cpp:45:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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