제출 #882704

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
882704		aeg	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1032 ms	21192 KiB

skyscraper

#pragma GCC optimize("Ofast,unroll-all-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
#include <bits/stdc++.h>
using namespace std;

const unsigned short MAXM = 3e4+5, MAXN = 3e4+5;

unsigned short n, m, secloc, p[MAXM];
vector<unsigned short> a(MAXN, UINT16_MAX);
queue<unsigned short> b[MAXN];

struct triple {
	unsigned short first, second;
	char third;
	triple() : first(0), second(0), third(0) {}
	triple(unsigned short a, unsigned short b, char c) :first(a), second(b), third(c) {}
};

queue<triple> curr, oth;

signed main() {
	cin.tie(0)->sync_with_stdio(0);
	cin >> n >> m;
	{
		unsigned short tmp;
		cin >> tmp >> p[0];
		curr.push({tmp, p[0], 3});
		b[tmp].push(0);
	}
	{
		unsigned short tmp;
		cin >> tmp >> p[1];
		secloc = tmp;
		b[tmp].push(1);
	}
	for(int i = 2; i < m; i++) {
		unsigned short tmp;
		cin >> tmp >> p[i];
		b[tmp].push(i);
	}
	unsigned short curval = 0;
	while(!curr.empty()) {
		auto cur = curr.front(); curr.pop();
		if(a[cur.first] == UINT16_MAX) {
			while(!b[cur.first].empty()) {
				unsigned short x = b[cur.first].front();
				b[cur.first].pop();
				if(p[x] != cur.second)
					curr.push({cur.first, p[x], 3});
			}
		}
		a[cur.first] = min(a[cur.first], curval);
		if(cur.first >= cur.second && cur.third & 1)
			oth.push({cur.first - cur.second, cur.second, 1});
		if(cur.first < n - cur.second && cur.third & 2)
			oth.push({cur.first + cur.second, cur.second, 2});
		if(curr.empty()) {
			swap(curr, oth);
			curval ++;
		}
	}
	cout << (a[secloc] == UINT16_MAX ? -1 : a[secloc]) << '\n';
}

컴파일 시 표준 에러 (stderr) 메시지

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:54:24: warning: narrowing conversion of '(((int)cur.triple::first) - ((int)cur.triple::second))' from 'int' to 'short unsigned int' [-Wnarrowing]
   54 |    oth.push({cur.first - cur.second, cur.second, 1});
      |              ~~~~~~~~~~^~~~~~~~~~~~
skyscraper.cpp:56:24: warning: narrowing conversion of '(((int)cur.triple::first) + ((int)cur.triple::second))' from 'int' to 'short unsigned int' [-Wnarrowing]
   56 |    oth.push({cur.first + cur.second, cur.second, 2});
      |              ~~~~~~~~~~^~~~~~~~~~~~

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