Submission #128640

#	Time	Username	Problem	Language	Result	Execution time	Memory
128640		antimirage	Rail (IOI14_rail)	C++14	0 / 100	86 ms	604 KiB

rail

#include "rail.h"
#include <bits/stdc++.h>

#define fr first
#define sc second
#define mk make_pair
#define pb push_back
#define all(s) s.begin(), s.end()

using namespace std;

const int N = 5005; 

int dist[2][N];

vector <int> lft;

bool cmp2 (int a, int b) {
	return dist[1][a] < dist[1][b];
}

void findLocation(int n, int pos, int a[], int t[])
{
	int mx = 0, ind, asd;
	a[0] = pos, t[0] = 1;
	
	if (n == 1) return;
	
	for (int i = 1; i < n; i++) {	
		dist[0][i] = getDistance(0, i);
		if (dist[0][i] > mx) {
			mx = dist[0][i];
			ind = i;
		}
	}
	a[ind] = pos + mx; t[ind] = 2;
	
	for (int i = 1; i < n; i++) {
		if (i == ind) continue;
		dist[1][i] = getDistance(ind, i);
		lft.pb(i);
	}
	sort(all(lft), cmp2);
	int lastc = -1, lastd = ind;
	
	for (int i = 0; i < (int)lft.size(); i++) {
		int it = lft[i];
		
		if (lastc == -1) {
			lastc = it;
			a[it] = a[ind] - dist[1][it];
			t[it] = 1;
		}
		else {
			int res = getDistance(lastc, it), nxt = a[ind] - dist[1][it];

			if (nxt >= 0 && res == 2 * (a[lastd] - a[lastc]) +  a[lastc] - nxt) {
				a[it] = nxt, lastc = it; t[it] = 1;
			}
			else {
				a[it] = a[lastc] + res; t[it] = 2;
				if (a[lastd] > a[it])
					lastd = it;
			}
		}
	}
}

Compilation message (stderr)

rail.cpp: In function 'void findLocation(int, int, int*, int*)':
rail.cpp:24:19: warning: unused variable 'asd' [-Wunused-variable]
  int mx = 0, ind, asd;
                   ^~~
rail.cpp:36:7: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized]
  a[ind] = pos + mx; t[ind] = 2;
       ^

• Subtask 1: 0 / 8
• Subtask 2: 0 / 22
• Subtask 3: 0 / 26
• Subtask 4: 0 / 44