Submission #1171587

#	Time	Username	Problem	Language	Result	Execution time	Memory
1171587		hainam2k9	Matryoshka (JOI16_matryoshka)	C++20	100 / 100	105 ms	7428 KiB

matryoshka

#include <bits/stdc++.h>
#define tt cin.tie(0), cout.tie(0), ios_base::sync_with_stdio(0)
#define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
#define ll long long
#define ull unsigned long long
#define i128 __int128
#define db long double
#define sz(a) ((int)(a).size())
#define pb push_back
#define pf emplace_front
#define pob pop_back
#define pof pop_front
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define ins emplace
#define mp make_pair
using namespace std;
const int MOD = 1e9+7, MAXN = 2e5+5;
const string NAME = "";
struct Query{
    int a,b,pos;
}query[MAXN];
int n,q,a,b,rs[MAXN];
pair<int,int> p[MAXN];
vector<int> v;
bool cmp1(pair<int,int>& a, pair<int,int>& b){
    if(a.fi==b.fi) return a.se<b.se;
    return a.fi>b.fi;
}
bool cmp2(Query& a, Query& b){
    if(a.a==b.a) return a.b<b.b;
    return a.a>b.a;
}
int main()
{
    tt;
    if(fopen((NAME + ".INP").c_str(), "r")) fo;
    cin >> n >> q;
    for(int i = 1; i<=n; ++i)
        cin >> p[i].fi >> p[i].se;
    for(int i = 1; i<=q; ++i)
        cin >> query[i].a >> query[i].b, query[i].pos=i;
    sort(p+1,p+n+1,cmp1);
    sort(query+1,query+q+1,cmp2);
    for(int i = 1, j = 1; i<=q; ++i){
        while(j<=n&&p[j].fi>=query[i].a){
            if(p[j].fi==query[i].a&&p[j].se>query[i].b) break;
            if(v.empty()||v.back()<=p[j].se) v.pb(p[j].se);
            else v[ub(v.begin(),v.end(),p[j].se)-v.begin()]=p[j].se;
            ++j;
        }
        if(!v.empty()&&v[0]<=query[i].b) rs[query[i].pos]=ub(v.begin(),v.end(),query[i].b)-v.begin();
    }
    for(int i = 1; i<=q; ++i)
        cout << rs[i] << "\n";
}

Compilation message (stderr)

matryoshka.cpp: In function 'int main()':
matryoshka.cpp:3:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
matryoshka.cpp:39:45: note: in expansion of macro 'fo'
   39 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~
matryoshka.cpp:3:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    3 | #define fo freopen((NAME+".INP").c_str(), "r", stdin), freopen((NAME+".OUT").c_str(), "w", stdout)
      |                                                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
matryoshka.cpp:39:45: note: in expansion of macro 'fo'
   39 |     if(fopen((NAME + ".INP").c_str(), "r")) fo;
      |                                             ^~

• Subtask 1: 11 / 11
• Subtask 2: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 49 / 49