Submission #1030798

#	Time	Username	Problem	Language	Result	Execution time	Memory
1030798		tolbi	Rail (IOI14_rail)	C++17	30 / 100	61 ms	2008 KiB

rail

#include "rail.h"
#include <bits/stdc++.h>
using namespace std;
map<pair<int,int>,int> mp;
int dist(int a, int b){
	if (mp.count({a,b})) return mp[{a,b}];
	return mp[{a,b}]=getDistance(a,b);
}
void findLocation(int N, int first, int location[], int stype[])
{
	int c = 0, d = 1;
	for (int i = 2; i < N; i++){
		if (dist(c,i)<dist(c,d)) d=i;
	}
	vector<int> left;
	vector<int> right;
	stype[c]=1,stype[d]=2;
	location[c]=first,location[d]=first+dist(c,d);
	for (int i = 0; i < N; i++){
		if (i==c || i==d) continue;
		if (dist(c,i)==dist(c,d)+dist(d,i)){
			if (dist(d,i)<dist(c,d)){
				location[i]=location[d]-dist(d,i);
				stype[i]=1;
			}
			else left.push_back(i);
		}
		else {
			right.push_back(i);
		}
	}
	sort(left.begin(), left.end(), [&](int a, int b){
		return dist(d,a)<dist(d,b);
	});
	sort(right.begin(), right.end(), [&](int a, int b){
		return dist(c,a)<dist(c,b);
	});
	if (left.size()){
		int fiC = left[0];
		set<int> virt;
		virt.insert(fiC);
		location[fiC]=location[d]-dist(d,fiC);
		stype[fiC]=1;
		for (int _ = 1; _ < left.size(); _++){
			int i = left[_];
			int vpos = dist(fiC,i);
			auto it = virt.lower_bound(vpos);
			if (it==virt.begin()){
				stype[i]=1;
				location[i]=location[d]-dist(d,i);
				fiC=i;
				virt.insert(fiC);
				continue;
			}
			it--;
			if (dist(*it,i)+dist(d,*it)==dist(d,i)){
				stype[i]=2;
				location[i]=location[fiC]+dist(fiC,i);
			}
			else {
				stype[i]=1;
				location[i]=location[d]-dist(d,i);
				fiC=i;
				virt.insert(fiC);
			}
		}
	}
	if (right.size()){
		int fiD = right[0];
		set<int> virt;
		virt.insert(fiD);
		location[fiD]=location[c]+dist(c,fiD);
		stype[fiD]=2;
		for (int _ = 1; _ < right.size(); _++){
			int i = right[_];
			int vpos = dist(fiD,i);
			auto it = virt.lower_bound(vpos);
			if (it!=virt.end() && dist(*it,i)+dist(c,*it)==dist(c,i)){				stype[i]=1;
				location[i]=location[fiD]-dist(fiD,i);
			}
			else {
				stype[i]=2;
				location[i]=location[c]+dist(c,i);
				fiD=i;
				virt.insert(fiD);
			}
		}
	}
}

Compilation message (stderr)

rail.cpp: In function 'void findLocation(int, int, int*, int*)':
rail.cpp:44:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |   for (int _ = 1; _ < left.size(); _++){
      |                   ~~^~~~~~~~~~~~~
rail.cpp:74:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |   for (int _ = 1; _ < right.size(); _++){
      |                   ~~^~~~~~~~~~~~~~

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