Submission #129099

#	Time	Username	Problem	Language	Result	Execution time	Memory
129099		antimirage	Rail (IOI14_rail)	C++14	30 / 100	85 ms	632 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 = 1e6 + 5; 

int dist[2][N];

vector <int> lft;

bool cmp1 (int a, int b) {
	return dist[0][a] < dist[0][b];
}

void findLocation(int n, int pos, int a[], int t[])
{
	int mn = 1e9 + 7, ind;
	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] < mn) {
			mn = dist[0][i];
			ind = i;
		}
	}
	a[ind] = pos + mn; t[ind] = 2;
	
	for (int i = 1; i < n; i++) {
		if (i == ind) continue;
		lft.pb(i);
	}
	sort(all(lft), cmp1);
	
	int C = 0, D = ind, lastC = 0;
	
	for (auto it : lft) {
		int res = getDistance(it, lastC); 
		int dist1 = getDistance(it, D);
		
		if (dist1 == res + a[D] - a[lastC]) {
			a[it] = a[lastC] + res;
			D = it;
			t[it] = 2;
		}
		else {
			a[it] = a[D] - dist1;
			t[it] = 1;
			if (a[it] < a[C]) {
				C = it;
			}
			else if (a[it] > a[lastC]){
				lastC = it;
			}
		}
	}
}

Compilation message (stderr)

rail.cpp: In function 'void findLocation(int, int, int*, int*)':
rail.cpp:36:7: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized]
  a[ind] = pos + mn; t[ind] = 2;
       ^

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