Submission #45228

#	Time	Username	Problem	Language	Result	Execution time	Memory
45228		gs14004	Golf (JOI17_golf)	C++17	30 / 100	103 ms	2176 KiB

golf

#include <bits/stdc++.h>
using namespace std;
typedef long long lint;
typedef long double llf;
typedef pair<int, int> pi;
const int MAXN = 300005;

int n, sx, sy;
pi s, e;
struct rect{ int sx, ex, sy, ey; }a[1005];
struct seg { int x, s, e, t; };
vector<seg> segs;
int dis[400500];

bool cross(seg a, seg b){
	return a.t != b.t && b.s <= a.x && a.x <= b.e && a.s <= b.x && b.x <= a.e;
}

void shoot(int x, int y){
	int minx = 0, maxx = sx-1;
	int miny = 0, maxy = sy-1;
	for(int i=0; i<n; i++){
		if(a[i].sy < y && a[i].ey > y){
			if(x <= a[i].sx) maxx = min(maxx, a[i].sx);
			if(x >= a[i].ex) minx = max(minx, a[i].ex);
		}
		if(a[i].sx < x && a[i].ex > x){
			if(y <= a[i].sy) maxy = min(maxy, a[i].sy);
			if(y >= a[i].ey) miny = max(miny, a[i].ey);
		}
	}
	if(minx < maxx){
		segs.push_back({y, minx, maxx, 0});
	}
	if(miny < maxy){
		segs.push_back({x, miny, maxy, 1});
	}
}

int main(){
	cin >> s.first >> s.second >> e.first >> e.second >> n;
	vector<int> vx = {s.first, e.first}, vy = {s.second, e.second};
	for(int i=0; i<n; i++){
		scanf("%d %d %d %d",&a[i].sx,&a[i].ex,&a[i].sy,&a[i].ey);
		vx.push_back(a[i].sx);
		vx.push_back(a[i].ex);
		vy.push_back(a[i].sy);
		vy.push_back(a[i].ey);
	}
	sort(vx.begin(), vx.end());
	vx.resize(unique(vx.begin(), vx.end()) - vx.begin());
	sort(vy.begin(), vy.end());
	vy.resize(unique(vy.begin(), vy.end()) - vy.begin());
	auto getloc = [&](int x, vector<int> &v){
		return lower_bound(v.begin(), v.end(), x) - v.begin();
	};
	s.first = getloc(s.first, vx);
	s.second = getloc(s.second, vy);
	e.first = getloc(e.first, vx);
	e.second = getloc(e.second, vy);
	for(int i=0; i<n; i++){
		a[i].sx = getloc(a[i].sx, vx);
		a[i].ex = getloc(a[i].ex, vx);
		a[i].sy = getloc(a[i].sy, vy);
		a[i].ey = getloc(a[i].ey, vy);
	}
	sx = vx.size();
	sy = vy.size();
	shoot(s.first, s.second);
	shoot(e.first, e.second);
	for(int i=0; i<n; i++){
		shoot(a[i].sx, a[i].sy);
		shoot(a[i].ex, a[i].ey);
	}
	shoot(0, 0);
	shoot(sx-1, sy-1);
	memset(dis, 0x3f, sizeof(dis));
	queue<int> que;
	for(int i=0; i<segs.size(); i++){
		if(segs[i].t == 1 && segs[i].x == s.first && segs[i].s <= s.second && segs[i].e >= s.second){
			dis[i] = 0;
			que.push(i);
		}
		if(segs[i].t == 0 && segs[i].x == s.second && segs[i].s <= s.first && segs[i].e >= s.first){
			dis[i] = 0;
			que.push(i);
		}
	}
	while(!que.empty()){
		int x = que.front();
		que.pop();
		for(int i=0; i<segs.size(); i++){
			if(dis[i] > dis[x] + 1 && cross(segs[x], segs[i])){
				dis[i] = dis[x] + 1;
				que.push(i);
			}
		}
	}
	int ret = 1e9;
	for(int i=0; i<segs.size(); i++){
		if(segs[i].t == 1 && segs[i].x == e.first && segs[i].s <= e.second && segs[i].e >= e.second){
			ret = min(ret, dis[i]);
		}
		if(segs[i].t == 0 && segs[i].x == e.second && segs[i].s <= e.first && segs[i].e >= e.first){
			ret = min(ret, dis[i]);
		}
	}
	cout << ret + 1 << endl;
}

Compilation message (stderr)

golf.cpp: In function 'int main()':
golf.cpp:79:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<segs.size(); i++){
               ~^~~~~~~~~~~~
golf.cpp:92:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0; i<segs.size(); i++){
                ~^~~~~~~~~~~~
golf.cpp:100:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<segs.size(); i++){
               ~^~~~~~~~~~~~
golf.cpp:44:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d %d",&a[i].sx,&a[i].ex,&a[i].sy,&a[i].ey);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 0 / 70