Submission #471093

#	Time	Username	Problem	Language	Result	Execution time	Memory
471093		robell	Art Exhibition (JOI18_art)	C++17	50 / 100	1069 ms	9068 KiB

art

#pragma GCC optimize("O2")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef tree<int,null_type,less<int>,rb_tree_tag, tree_order_statistics_node_update> indexed_set;
typedef long long ll;
#define pb push_back
#define eb emplace_back
#define countbits __builtin_popcount
#define beg0 __builtin_clz
#define terminal0 __builtin_ctz
#define mod 1e9+7
void setIO(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
}
void setIO(string f){
	freopen((f+".in").c_str(),"r",stdin);
	freopen((f+".out").c_str(),"w",stdout);
	setIO();
}
pair<ll,ll> v[500000];
int N;
ll check(ll D){
	int l=0;
	int r=0;
	ll col = 0;
	ll maxv = -1e18;
	while (l<N){
		if (r!=N){
			if (v[r].first-v[l].first<=D){
				col+=v[r].second;
				r++;
			}else{
				maxv=max(col-(v[r-1].first-v[l].first),maxv);
				l++;
				col-=v[l].second;
			}
		}else{
			maxv=max(col-(v[r-1].first-v[l].first),maxv);
			l++;
			col-=v[l].second;
		}
	}
	return maxv;
}
int main(){
	setIO();
	cin >> N;
	for (int i=0;i<N;i++){
		cin >> v[i].first >> v[i].second;
	}
	sort(v,v+N);
	// ll maxD = v[N-1].first-v[0].first;
	// ll minD = 0;
	// while (minD!=maxD){
	// 	ll mid = (maxD+minD+1)/2;
	// 	if (check(mid)>=check(mid+1)){
	// 		minD=mid;
	// 	}else{
	// 		maxD=mid-1;
	// 	}
	// }
	// cout << check(minD) << " " << minD << "\n";
	ll maxv = -1e18;
	for (int i=0;i<N;i++){
		ll col = 0;
		for (int j=i;j<N;j++){
			col+=v[j].second;
			maxv=max(maxv,col-(v[j].first-v[i].first));
		}
	}
	cout << maxv << "\n";
}

Compilation message (stderr)

art.cpp: In function 'void setIO(std::string)':
art.cpp:19:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |  freopen((f+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
art.cpp:20:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |  freopen((f+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 50