Submission #992620

#	Time	Username	Problem	Language	Result	Execution time	Memory
992620		SN0WM4N	Robot (JOI21_ho_t4)	C++14	100 / 100	1065 ms	113116 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;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

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);}

struct edge{
	int b, c; 
	ll p;
	edge(int _b, int _c, ll _p) : b(_b), c(_c), p(_p) {}
};

int n, m;
vector<map<int, vector<edge>>> g; 
vector<map<int, ll>> dis, sum;

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

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

	for (int i = 1; i <= m; i ++) {
		int a, b, c; ll p;
		cin >> a >> b >> c >> p;

		g[a][c].push_back(edge(b, c, p));
		g[b][c].push_back(edge(a, c, p));
		sum[a][c] += p;
		sum[b][c] += p;
	}

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

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

		if (dis[x].count(c) && dis[x][c] <= d)
			continue;
		dis[x][c] = d;

		if (c == 0) {
			for (auto &Color : g[x]) {
				for (auto y : Color.S) {
					q.push({d + y.p, {y.b, 0}});
					q.push({d + sum[x][y.c] - y.p, {y.b, 0}});
					q.push({d, {y.b, y.c}});
				}
			}
		} else {
			for (auto &y : g[x][c]) {
				q.push({d + sum[x][c] - y.p, {y.b, 0}});
			}
		}
	}

	dbg(dis[n]);

	cout << (!dis[n].count(0) ? -1 : dis[n][0]) << "\n";

	return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.cpp:93:8: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   93 |   auto [x, c] = q.top().S;
      |        ^
Main.cpp:18:19: warning: statement has no effect [-Wunused-value]
   18 |  #define dbg(...) 0
      |                   ^
Main.cpp:115:2: note: in expansion of macro 'dbg'
  115 |  dbg(dis[n]);
      |  ^~~
Main.cpp: In function 'void set_IO(std::string)':
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(in.c_str(),  "r",  stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:48:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |  freopen(out.c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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