Submission #518891

#	Time	Username	Problem	Language	Result	Execution time	Memory
518891		sudheerays123	Ferries (NOI13_ferries)	C++17	17 / 40	150 ms	14356 KiB

ferries

#include <bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define ll long long int
#define tc ll test;cin >> test;while(test--)
#define vi vector<ll>
#define pll pair<ll,ll>
#define pb push_back
#define mp make_pair
#define INF 1e18
#define MOD 1000000007
#define ff first
#define ss second
#define in >>
#define out <<
#define space << " " <<
#define spacef << " "
#define fo(i,a,b) for(ll i = a; i <= b; i++)
#define nextline out "\n"
#define print(x) for(auto i : x ) cout out i spacef
#define mmax(x,i) x = max(x,i)
#define mmin(x,i) x = min(x,i)
#define N 105

int main() {
    
    fast;

    ll n,m;
    cin in n in m;

	vector<pll> reverse_adj[n+5];
	vector<pll> nodes;

    fo(i,1,m){
        ll a,b,c;
        cin in a in b in c;

		reverse_adj[b].pb(mp(a,c));
		if(a == 1) nodes.pb(mp(b,c));
    }

	vi dist(n+5,INF);
	priority_queue<pll> q;
	vector<bool> visited(n+5);

	q.push(mp(0,n));
	dist[n] = 0;

	while(!q.empty()){
		ll a = q.top().second;
		q.pop();

		if(visited[a]) continue;
		visited[a] = true;

		for(auto u : reverse_adj[a]){
			if(dist[a]+u.second < dist[u.first]){
				dist[u.first] = dist[a]+u.second;
				q.push(mp(-dist[u.first],u.first));
			}
		}
	}

	vi first;
	vi second;

	for(auto u : nodes){
		first.pb(dist[u.first]);
		second.pb(u.second);
	}

	sort(first.begin(),first.end());
	sort(second.rbegin(),second.rend());

	ll minans = INF;
	
	fo(i,0,nodes.size()-1) mmin(minans,first[i]+second[i]);

	cout out minans;

    return 0;
}

Compilation message (stderr)

ferries.cpp: In function 'int main()':
ferries.cpp:18:35: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 | #define fo(i,a,b) for(ll i = a; i <= b; i++)
......
   78 |  fo(i,0,nodes.size()-1) mmin(minans,first[i]+second[i]);
      |     ~~~~~~~~~~~~~~~~~~             
ferries.cpp:78:2: note: in expansion of macro 'fo'
   78 |  fo(i,0,nodes.size()-1) mmin(minans,first[i]+second[i]);
      |  ^~

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 0 / 11
• Subtask 4: 0 / 12