Submission #105795

#	Time	Username	Problem	Language	Result	Execution time	Memory
105795		gs18103	먼 별 (KOI16_dist)	C++98	0 / 100	4 ms	512 KiB

dist

#include <bits/stdc++.h>

using namespace std;

long long arr[1010][4];
long long ans;
int n, T;
long long dp[10101010];

long long cal_dis(int t)
{
	if(dp[t] != 0) return dp[t];
	long long dis;
	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < n; j++)
		{
			if(i == j) continue;
			dis = max(dis, (arr[i][0]-arr[j][0]+t*(arr[i][2]-arr[j][2]))*(arr[i][0]-arr[j][0]+t*(arr[i][2]-arr[j][2]))+
						   (arr[i][1]-arr[j][1]+t*(arr[i][3]-arr[j][3]))*(arr[i][1]-arr[j][1]+t*(arr[i][3]-arr[j][3])));
		}
	}
	return dp[t] = dis;
}

int search(int s, int e)
{
	if(s == e)
	{
		return s;
	}
	if(s + 1 == e)
	{
		if(cal_dis(s) > cal_dis(e)) return e;
		else return s;
	}
	if(s + 2 == e)
	{
		long long d = min(cal_dis(s), min(cal_dis(s+1), cal_dis(e)));
		if(d == cal_dis(s)) return s;
		if(d == cal_dis(s+1)) return s+1;
		if(d == cal_dis(e)) return e;
	}
	int t1 = s + (e - s) / 3, t2 = s + ((e - s) * 2) / 3;
	long long dis1 = cal_dis(t1), dis2 = cal_dis(t2);
	if(dis1 < dis2) return search(s, t2-1);
	else return search(t1+1, e);
}

int main()
{
	scanf("%d %d", &n, &T);
	for(int i = 0; i < n; i++)
		for(int j = 0; j < 4; j++)
			scanf("%lld", &arr[i][j]);
	int ans = search(0, T);
	printf("%d\n%lld", ans, cal_dis(ans));
}

Compilation message (stderr)

dist.cpp: In function 'int main()':
dist.cpp:52:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &T);
  ~~~~~^~~~~~~~~~~~~~~~~
dist.cpp:55:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%lld", &arr[i][j]);
    ~~~~~^~~~~~~~~~~~~~~~~~~~
dist.cpp: In function 'long long int cal_dis(int)':
dist.cpp:13:12: warning: 'dis' may be used uninitialized in this function [-Wmaybe-uninitialized]
  long long dis;
            ^~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 40
• Subtask 3: 0 / 39
• Subtask 4: 0 / 19