Submission #990241

#	Time	Username	Problem	Language	Result	Execution time	Memory
990241		SN0WM4N	Robot (JOI21_ho_t4)	C++14	0 / 100	160 ms	17004 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define sort undefined_function // To use stable_sort instead sort 
#define bpc __builtin_popcount
#define ull unsigned long long
#define ld double
#define ll long long
#define mp make_pair
#define F first
#define S second

#pragma GCC optimize("O3")

#ifdef LOCAL 
	#include "debug.h"
#else 
	#define dbg(...) 0
#endif

using namespace __gnu_pbds;
using namespace std;

typedef tree<long long, null_type, less_equal<long long>,
    rb_tree_tag, tree_order_statistics_node_update> Tree;

const ll INF = 9223372036854775807LL;
const ll inf = 2147483647;
const ll MOD = 1e9 + 7; //[998244353, 1e9 + 7, 1e9 + 13]
const ld PI = acos(-1);
const ll NROOT = 500;

ll binpow(ll a, ll b, ll _MOD = -1) {
	if (_MOD == -1)
		_MOD = MOD;
	ll res = 1;
	for (; b; b /= 2, a *= a, a %= _MOD)
		if (b & 1) res *= a, res %= _MOD;
	return res;
}

void set_IO(string s) {
#ifndef LOCAL
	string in  = s +  ".in";
	string out = s + ".out";
	freopen(in.c_str(),  "r",  stdin);
	freopen(out.c_str(), "w", stdout);
#endif
}

bool dataOverflow(ll a, ll b) {return (log10(a) + log10(b) >= 18);}
ll gcd(ll a, ll b) {return b ? gcd(b, a % b) : a;}
ll lcm(ll a, ll b) {return a * b / gcd(a, b);}
ll ceil(ll a, ll b) {return (a + b - 1) / b;}
ll invmod(ll a) {return binpow(a, MOD - 2);}

int n, m;
vector<vector<pair<int, pair<int, int>>>> g;

int32_t main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);

	cin >> n >> m;
	g.resize(n + 1);

	int index = 0;
	for (int i = 1; i <= m; i ++)  {
		int a, b, c, d;
		cin >> a >> b >> c >> d;

		index = max(index, c + 1);

		g[a].push_back({b, {c, d}});
		g[b].push_back({a, {c, d}});
	}

	using T = pair<ll, int>;
	priority_queue<T, vector<T>, greater<T>> q;
	q.push({0, 1});

	vector<ll> dis(n + 1, INF);

	while (!q.empty()) {
		auto [d, x] = q.top();
		q.pop();

		if (dis[x] <= d)
			continue; 
		dis[x] = d;

		map<int, int> f;
		for (auto &y : g[x]) 
			f[y.S.F] ++;

		for (auto &y : g[x]) {
			if (f[y.S.F] > 1) {
				q.push({d + y.S.S, y.F});
				y.S.F = index + 1;
				f[y.S.F] --;
			}
			else 
				q.push({d, y.F});
		}
	}

	if (dis[n] == INF)
		cout << "-1\n";
	else 
		cout << dis[n] << "\n";

	return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.cpp:85:8: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   85 |   auto [d, x] = q.top();
      |        ^
Main.cpp: In function 'void set_IO(std::string)':
Main.cpp:46:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |  freopen(in.c_str(),  "r",  stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:47:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |  freopen(out.c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 34
• Subtask 2: 0 / 24
• Subtask 3: 0 / 42