Submission #144872

#	Time	Username	Problem	Language	Result	Execution time	Memory
144872		12tqian	Exhibition (JOI19_ho_t2)	C++14	100 / 100	78 ms	5796 KiB

joi2019_ho_t2

#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

const double PI = 4 * atan(1);

#define sz(x) (int)(x).size()
#define ll long long
#define ld long double
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define vi vector<int>
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define vpi vector<pair<int, int>>
#define vpd vector<pair<double, double>>
#define pd pair<double, double>

#define f0r(i,a) for(int i=0;i<a;i++)
#define f1r(i,a,b) for(int i=a;i<b;i++)
#define trav(a, x) for (auto& a : x)

template<typename A, typename B> ostream& operator<<(ostream &cout, pair<A, B> const &p) { return cout << "(" << p.f << ", " << p.s << ")"; }
template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v) {
  cout << "["; for(int i = 0; i < v.size(); i++) {if (i) cout << ", "; cout << v[i];} return cout << "]";
}

void fast_io(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
}
void io(string taskname){
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char* FIN = fin.c_str();
    const char* FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);
    fast_io();
}
const int MAX = 1e5 + 5;
vpi pic;
vi frame;
vi img;
int n, m;
int verify(int x){
    if(x == 0) return 1;
    //cout << x << endl;
    vi use;
    for(int i = m-x; i<m; i++){
        use.eb(frame[i]);
    }
    int ptr = 0;
   // cout << use << endl;
   // cout <<img << endl;
    f0r(i, n){
        if(ptr == x) return 1;
        if(img[i]<=use[ptr]){
              //  cout << img[i] << " " << use[ptr] << " " << ptr << " "<< i <<  endl;
            ptr++;
        }
    }
   // cout << ptr << " bad" << x << endl;
    if(ptr >= x) return 1;
    //cout << "here" << endl;
    return 0;
}
int main(){
    fast_io();
    cin >> n >> m;
    f0r(i, n){
        int ai, bi;
        cin >> ai >> bi;
        pic.eb(mp(bi, ai));
    }
    f0r(i,m){
        int ci;
        cin >> ci;
        frame.eb(ci);
    }
    sort(all(pic));
    f0r(i, n) img.eb(pic[i].s);
    sort(all(frame));
    int l = 0;
    int r = m;
    while(abs(l-r)>1){
        int mid = (l+r)/2;
        int check = verify(mid);
        if(check == 1){
            l = mid;
        }
        else{
            r = mid-1;
        }
    }
    if(l>r) swap(l, r);
    if(verify(r)) cout << r << endl;
    else cout << l << endl;
    return 0;
}

Compilation message (stderr)

joi2019_ho_t2.cpp:1:0: warning: ignoring #pragma comment  [-Wunknown-pragmas]
 #pragma comment(linker, "/stack:200000000")
 
joi2019_ho_t2.cpp: In function 'void io(std::__cxx11::string)':
joi2019_ho_t2.cpp:52:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(FIN, "r", stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~
joi2019_ho_t2.cpp:53:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(FOUT, "w", stdout);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~

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