제출 #20862

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
20862		Silver	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1000 ms	80204 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
typedef int ll;
typedef pair<ll, ll> P;
typedef pair<ll, P> LP;
#define N 30004
#define OO int(1e9)
#define mp make_pair
#define pb push_back
vector<P>v[N];
vector<int>g[N];
ll x, y, z, dis[N][303], n, m, res, r, st, en, w, po;
priority_queue<LP, vector<LP>, greater<LP> >q;
LP f;
bool can(int pos)
{
	return pos >= 0 && pos < n;
}
inline void normal_node()
{
	for (auto u : v[x])//normal edge
	if (w + u.second < dis[u.first][0])
		dis[u.first][0] = w + u.second, q.push(mp(dis[u.first][0], mp(u.first, 0)));
	for (auto u : g[x])//power edge
	if (dis[x][u]>w)
		dis[x][u] = w, q.push(mp(w, mp(x, u)));
}
int main()
{
	scanf("%d%d", &n, &m);
	en = n;
	r = sqrt(double(n));
	for (int i = 0; i <= n; i++)
	for (int j = 0; j <= r; j++)
		dis[i][j] = OO;
	for (int i = 0; i < m; i++)
	{
		scanf("%d%d", &x, &y);
		if (i == 0)st = x;
		else if (i == 1)en = x;
		if (y>r)
		{
			for (int i = x - y, j = 1; i >= 0; i -= y, j++)v[x].pb(mp(i, j));
			for (int i = x + y, j = 1; i < n; i += y, j++)v[x].pb(mp(i, j));
		}
		else
			g[x].pb(y);
	}
	dis[st][0] = 0;
	q.push(mp(0, mp(st, 0)));
	for (auto u : g[st])
		dis[st][u] = 0, q.push(mp(0, mp(st, u)));
	while (!q.empty())
	{
		f = q.top();
		q.pop();
		x = f.second.first;
		w = f.first;
		po = f.second.second;
		if (po != 0)//power node
		{
			y = x + po;
			if (can(y) && w + 1 < dis[y][po])dis[y][po] = w + 1, q.push(mp(dis[y][po], mp(y, po)));
			y = x - po;
			if (can(y) && w + 1 < dis[y][po])dis[y][po] = w + 1, q.push(mp(dis[y][po], mp(y, po)));
			if (dis[x][0] > w)dis[x][0] = w, q.push(mp(w, mp(x, 0)));
		}
		else
			normal_node();
	}
	res = OO;
	for (int i = 0; i <= r; i++)res = min(res, dis[en][i]);
	if (res >= OO)res = -1;
	printf("%d\n", res);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:30:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
                       ^
skyscraper.cpp:38:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &x, &y);
                        ^

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 21 / 21
• Subtask 5: 0 / 43