Submission #1089976

#	Time	Username	Problem	Language	Result	Execution time	Memory
1089976		coolsentenceidontremember	Robot (JOI21_ho_t4)	C++17	0 / 100	224 ms	48964 KiB

Main

/*


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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);
	}
}
const ll inf = 1e18;
vector<pair<ll, int>> G[400001];
vector<pair<int, pair<ll, int>>> adj[100001];
ll dis[400001];
int main(){
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < m; i++){
    	int a, b, c;
    	ll p;
    	cin >> a >> b >> c >> p;
    	adj[a].push_back(mp(c, mp(p, b)));
    	adj[b].push_back(mp(c, mp(p, a)));
	}
	int node = n;
	for (int i = 1; i <= n; i++){
		int sz = adj[i].size();
		if (!sz) continue;
		sort(adj[i].begin(), adj[i].end());
		for (int l = 0, r = 0; l < sz; l = r){
			ll sum = 0;
			while (r < sz && adj[i][l].f == adj[i][r].f) sum += adj[i][r++].s.f;
			if (r - l == 1) G[i].push_back(mp(0, adj[i][l].s.s));
			else {
				node++;
				G[i].push_back(mp(0, node));
				for (int x = l; x < r; x++){
					pair<ll, int> p = adj[i][x].s;
					G[i].push_back(p);
				//	G[p.s].push_back(mp(0, node));
					G[node].push_back(mp(sum - p.f, p.s));
				}
			}
		}
	}
	priority_queue<pair<ll, int>> pq;
	pq.push(mp(0, 1));
	for (int i = 0; i <= 400000; i++) dis[i] = inf;
	dis[1] = 0;
	while (!pq.empty()){
		pair<ll, int> p = pq.top();
		pq.pop();
		if (-p.f > dis[p.s]) continue;
		int u = p.s;
		for (auto &[w, v] : G[u]){
			if (-p.f + w < dis[v]){
				dis[v] = w - p.f;
				pq.push(mp(p.f - w, v));
			}
		}
	}
	cout << (dis[n] >= inf ? -1 : dis[n]);
}

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.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);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.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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