제출 #382524

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
382524		ignaciocanta	구경하기 (JOI13_watching)	C++14	100 / 100	573 ms	16380 KiB

watching

#include <bits/stdc++.h>
 
using namespace std;
 
using tint = long long;
using ld = long double;
 
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)
 
using pi = pair<int,int>;
using pl = pair<tint,tint>;
using vi = vector<int>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vvi = vector<vi>;
using vl = vector<tint>;
using vb = vector<bool>;
 
#define pb push_back
#define pf push_front
#define rsz resize
#define all(x) begin(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sz(x) (int)(x).size()
#define ins insert
 
#define f first
#define s second
#define mp make_pair
 
#define DBG(x) cerr << #x << " = " << x << endl;
 
const int MOD = 1e9+9; //change this
const tint mod = 998244353;
const int MX = 2005;
const tint INF = 1e18; 
const int inf = 2e9;
const ld PI = acos(ld(-1)); 
const ld eps = 1e-5;
 
const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, 1, -1};
 
template<class T> void remDup(vector<T> &v){ 
    sort(all(v)); v.erase(unique(all(v)),end(v));
}
 
template<class T> bool ckmin(T& a, const T& b) {
    return b < a ? a = b, 1 : 0; 
} 
template<class T> bool ckmax(T& a, const T& b) {
    return a < b ? a = b, 1 : 0; 
}
 
bool valid(int x, int y, int n, int m){
    return (0<=x && x<n && 0<=y && y<m);
}
 
int cdiv(int a, int b) { return a/b+((a^b)>0&&a%b); } //redondea p arriba
int fdiv(int a, int b) { return a/b-((a^b)<0&&a%b); } //redondea p abajo
 
void NACHO(string name = ""){
    ios_base::sync_with_stdio(0); cin.tie(0);
    if(sz(name)){
        freopen((name+".in").c_str(), "r", stdin);
        freopen((name+".out").c_str(), "w", stdout);
    }
}

vi a;
vvi dp;
int n, p, q;

bool f(int w){
	dp.clear();
	dp.rsz(n+1, vi(min(n+1, p+1), inf));
	dp[0][0] = 0;
	int l = 1, r = 1;
	FOR(i, 1, n+1){
		while(a[i]-a[l]+1 > w) ++l;
		while(a[i]-a[r]+1 > 2*w) ++r;
		F0R(j, min(n+1, p+1)){
			if(j > 0) ckmin(dp[i][j], dp[l-1][j-1]);
			ckmin(dp[i][j], dp[r-1][j]+1);
		}
	}
	int mini = inf;
	F0R(j, min(n+1, p+1)) ckmin(mini, dp[n][j]);
	if(mini <= q) return 1;
	return 0;
}

int main(){
	NACHO();
	cin >> n >> p >> q;
	a.rsz(n+1);
	FOR(i, 1, n+1) cin >> a[i];
	int low = 0, high = 1e9;
	sort(all(a));
	while(high-low > 1){
		int mid = low+(high-low)/2;
		if(f(mid)) high = mid;
		else low = mid;
	}
	cout << high << "\n";
}

컴파일 시 표준 에러 (stderr) 메시지

watching.cpp: In function 'void NACHO(std::string)':
watching.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   69 |         freopen((name+".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
watching.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   70 |         freopen((name+".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 50 / 50
• Subtask 2: 50 / 50