Submission #114413

#	Time	Username	Problem	Language	Result	Execution time	Memory
114413		tjd229	Rail (IOI14_rail)	C++14	30 / 100	113 ms	57300 KiB

rail

#include <stdio.h>
#include "rail.h"
#include <vector>
#include <algorithm>
#define pii pair<int,int>
using namespace std;
int d[5000][5000];
int getDist(int i,int j) {
	if (i == j) return 0;
	if (!d[i][j])
		d[i][j] = d[j][i] = getDistance(i,j);
	return d[i][j];
}
void findLocation(int N, int first, int location[], int stype[])
{
	int i; location[0] = first; stype[0] = 1;	
	vector<pii > v; int rc=0;
	int fi = 0; int mn = 1e9;
	for (i = 1; i < N; ++i) {
		int d = getDist(0, i);
		if (mn > d) {
			mn = d; 
			fi = i;
		}
	}
	location[fi] = first + mn;
	stype[fi] = 2;
	for (i = 1; i < N; ++i) {//find closest C
		if (i == fi) continue;
		int dist = getDist(fi,i);
		if (getDist(0, i) > dist && dist < getDist(0, fi)
			&& getDist(0, i) - getDist(0, fi) == dist) {			
			stype[i] = 1;
			location[i] = location[fi] - dist;
			if (location[rc] < location[i]) rc = i;			
		}
		else v.push_back({getDist(i,0),i});
		
	}
	sort(v.begin(), v.end());
	int r = -1,l=-1;
	for (auto p : v) {
		int x = p.second;
		d[rc][x] = d[x][rc] = getDist(0, x) - (location[rc]-location[0]);
		//printf("x:%d,%d\n", x,d[rc][x]);
		if (getDist(rc, x) < getDist(x, fi)) {
			if (r > 0 && getDist(rc, x) == getDist(x, r) + getDist(rc, r)) {
				stype[x] = 1;
				location[x] = location[r] - getDist(r,x);
			}
			else {
				r = x;
				stype[x] = 2;
				location[x] = location[rc]+getDist(rc,x);
			}
		}
		else {
			if (l > 0 && getDist(fi, x) == getDist(l, x) + getDist(fi, l)) {
				stype[x] = 2;
				location[x] = location[l] + getDist(l,x);
			}
			else {
				l = x;
				stype[x] = 1;
				location[x] = location[fi] - getDist(fi,x);
			}
		}
	}
}

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