제출 #893380

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
893380		vjudge1	Road Construction (JOI21_road_construction)	C++17	11 / 100	616 ms	22356 KiB

road_construction

#include <bits/stdc++.h>
 
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define int long long
#define rnd(l, r) uniform_int_distribution<int>(l, r)(rng)
 
using namespace std;

void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);} 
int pow(int a,int b,int m){int ans=1;while(b){if(b&1){ans=(ans*a)%m;}b>>=1;a=(a*a)%m;}return ans;}
int binpow(int a,int b){int ans=1;while(b){if(b&1){ans=(ans*a);}b>>=1;a=(a*a);}return ans;}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int N = 3e5 + 10, inf = 1e9;

int x[N], y[N];
int k;

main(){
	iostream::sync_with_stdio(false);	
    cin.tie(nullptr);
    cout.tie(nullptr);
	int n;
	cin >> n >> k;
	set <int> sty;
	for(int i = 1; i <= n; i++){
		cin >> x[i] >> y[i];
	}
	if(n <= 1000){
		vector <int> dists;
		for(int i = 1; i <= n; i++){
			for(int j = i + 1; j <= n; j++){
				dists.pb(abs(x[i] - x[j]) + abs(y[i] - y[j]));
			}
		}
		sort(all(dists));
		for(int i = 0; i < k; i++){
			cout << dists[i] <<"\n";
		}
	}else{
		multiset <pair <int,int> > st;
		sort(x + 1, x + n + 1);
		for(int i = 1; i <= n - 1; i++){
			st.insert({x[i + 1] - x[i], i + 1});
		}
		while(k--){
			cout << st.begin() -> ff << endl;
			pair <int,int> f = *st.begin();
			st.erase(st.begin());
			if(f.ss == n)continue;
			st.insert({f.ff + x[f.ss + 1] - x[f.ss], f.ss + 1});
		}
		
	}
	//cout << endl;
}
/*
 * Before implementing the problem:
	
	Do I understand the problem correctly?
	Which places are tricky? What do I need to remember to implement them correctly?
	Which place is the heaviest by implementation? Can I do it simpler?
	Which place is the slowest? Where do I need to be careful about constant factors and where I can choose slower but simpler implementation?
	----------------------------------
	If not AC:
 
	Did you remember to do everything to handle the tricky places you thought about before?
	Is the solution correct?
	Do I understand the problem correctly?
	----------------------------------
	If you have a test on which the solution gives wrong answer:
 
	Is the solution doing what it was supposed to do?
	Is the problem in the code or in the idea?
*/

컴파일 시 표준 에러 (stderr) 메시지

road_construction.cpp:23:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   23 | main(){
      | ^~~~
road_construction.cpp: In function 'void fp(std::string)':
road_construction.cpp:13:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 | void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
road_construction.cpp:13:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 | void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 6 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 20
• Subtask 5: 0 / 27
• Subtask 6: 0 / 35