Submission #1089499

#	Time	Username	Problem	Language	Result	Execution time	Memory
1089499		coolsentenceidontremember	Commuter Pass (JOI18_commuter_pass)	C++17	15 / 100	1386 ms	262144 KiB

commuter_pass

/*


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*/



#include"bits/stdc++.h"
#pragma GCC optimize("O3", "unroll-loops")
#define ll long long
#define ld long double
#define f first
#define s second
#define db double
#define time_begin() auto begin = chrono::high_resolution_clock::now()
#define time_end() auto end = chrono::high_resolution_clock::now(); auto elapsed = chrono::duration_cast<chrono::nanoseconds>(end-begin); auto sec = elapsed.count() * 1e-9; cerr << "\n\nExecution time: " << sec << " seconds";
#define check_time() cerr << "\nStatus : "; if (sec>1) cerr << "Time Limit Exceeded 1!!!1!111"; else cerr << "You good brother"
#define precision(x) fixed << setprecision((x))
#define check_ok(s) cout << s << " is aight" << '\n'
#define pii pair<int, int>
#define mp make_pair
using namespace std;

void setIO(string s = ""){
 ios_base::sync_with_stdio(false);
 cin.tie(nullptr);
 cout.tie(nullptr);
 if (!s.empty()){
	freopen((s+".in").c_str(), "r", stdin);
	freopen((s+".out").c_str(), "w", stdout);
	}
}

int n, m, s, t, u, v;

const ll inf = 1e18;

ll dis[100000][2], dp[100000][2];

vector<pii> adj[100000];

bool vis[100000];

ll ans;

void dijkstra1(int start, int sign){
	for (int i = 0; i < n; i++) dis[i][sign] = inf;
	dis[start][sign] = 0;
	priority_queue<pair<ll, int>> pq;
	pq.push(mp(0, start));
	while (!pq.empty()){
		ll cdis = -pq.top().f;
		int k = pq.top().s;
		pq.pop();
		if (cdis > dis[k][sign]) continue;
		//cout << cdis << ' ' << k << '\n';
		for (auto &[j, w] : adj[k]){
			if (cdis + w < dis[j][sign]){
				dis[j][sign] = cdis + w;
				pq.push(mp(-dis[j][sign], j));
			}
		}
	}
}

void dijkstra2(int from, int to){
	fill(&dp[0][0], &dp[0][0] + sizeof(dp)/sizeof(ll), inf);
	memset(vis, 0, sizeof vis);
	vector<ll> d(n, inf);
	priority_queue<pair<ll, pii>> pq;
	pq.push(mp(0, mp(from, 0)));
	while (!pq.empty()){
		pair<ll, pii> p = pq.top();
		pq.pop();
		ll cdis = -p.f;
		int k = p.s.f, par = p.s.s;
		if (cdis > d[k]) continue;
		d[k] = cdis;
		dp[k][0] = min(dis[k][0], dp[par][0]);
		dp[k][1] = min(dis[k][1], dp[par][1]);
		for (auto &[j, w] : adj[k]) pq.push(mp(-cdis - w, mp(j, k))); 
	}
}
	
int main(){
    cin >> n >> m >> s >> t >> u >> v;
    --s; --t; --u; --v;
    for (int i = 1; i <= m; i++){
    	int a, b, c;
    	cin >> a >> b >> c;
		adj[--a].push_back(mp(--b, c));
		adj[b].push_back(mp(a, c));
	}
		
	dijkstra1(u, 0);
	dijkstra1(v, 1);
	ans = dis[v][0];
	dijkstra2(s, t);
	ans = min(ans, dp[t][0] + dp[t][1]);
	swap(s, t);
	dijkstra2(s, t);
	ans = min(ans, dp[t][0] + dp[t][1]);
	cout << ans;
	
}

Compilation message (stderr)

commuter_pass.cpp: In function 'void setIO(std::string)':
commuter_pass.cpp:144:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  144 |  freopen((s+".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
commuter_pass.cpp:145:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  145 |  freopen((s+".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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