Submission #850480

#	Time	Username	Problem	Language	Result	Execution time	Memory
850480		hqminhuwu	Robot (JOI21_ho_t4)	C++17	100 / 100	1016 ms	110064 KiB

Main

#include <bits/stdc++.h>
#define forr(_a,_b,_c) for(_a = _b; _a <= _c; ++_a)
#define ford(_a,_b,_c) for(_a = (_b) + 1; _a --> _c;)
#define forf(_a,_b,_c) for(_a = _b; _a < _c; ++_a)
#define st first
#define nd second
#define ll long long
#define ull unsigned long long
#define pii pair <ll,ll>
#define pll pair <ll,ll>
#define piii pair <ll,pii>
#define vi vector <int>
#define pb push_back
#define mp make_pair
#define all(x) begin(x),end(x)
#define file "test"
#define ns nd.st
#define nn nd.nd

using namespace std;
const int N = 2e5 + 5;
const ll oo = 1e18;
const ll mod = 1e9 + 7;

map <int,vector<piii>> a[N];
map <int,ll> dp[N],sum[N];
priority_queue <piii,vector<piii>,greater<piii>> q;

void calc(){
	q.push({0,{-1,0}});
	while (!q.empty()){
		piii  u= q.top();
		q.pop();
		u.ns = - u.ns;
		u.nn = -u.nn;
		if (u.st != dp[u.ns][u.nn])
			continue;
		//cout << u.st << " " << u.ns << " " << u.nn << "\n";
		if (!u.nn){
			for (auto &f : a[u.ns])
			for (piii v : f.nd){
				ll cost = u.st + sum[u.ns][v.ns] - v.nn;
				if (dp[v.st][0] > cost)
					dp[v.st][0] = cost, q.push({dp[v.st][0],{-v.st,0}});
				//cout << cost << " ";
				cost = u.st + v.nn;
				//cout << cost << " ";
				if (dp[v.st][0] > cost)
					dp[v.st][0] = cost, q.push({dp[v.st][0],{-v.st,0}});
				cost = u.st;
				//cout << cost << "\n";
				if (!dp[v.st][v.ns] || dp[v.st][v.ns] > cost)
					dp[v.st][v.ns] = cost, q.push({dp[v.st][v.ns],{-v.st,-v.ns}});
			}
		}
		else {
			for (piii v : a[u.ns][u.nn]){
				ll cost = u.st + sum[u.ns][u.nn] - v.nn;
				//cout << cost << "\n";
				if (dp[v.st][0] > cost)
					dp[v.st][0] = cost, q.push({cost,{-v.st,0}});
			}
		}
	}
}

int n,m,i,u,v,w,t;
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin >> n >> m;
	forr (i,1,m){
		cin >> u >> v >> w >> t;
		a[u][w].pb({v,{w,t}});
		a[v][w].pb({u,{w,t}});
		sum[v][w] += t;
		sum[u][w] += t;
	}
	forr (i,2,n)
		dp[i][0] = oo;
	calc();
	if (dp[n][0] == oo)
        cout << "-1";
    else
	cout << dp[n][0];
	return 0;
}
/*



*/

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:83:5: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   83 |     else
      |     ^~~~
Main.cpp:85:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
   85 |  return 0;
      |  ^~~~~~

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