Submission #531589

#	Time	Username	Problem	Language	Result	Execution time	Memory
531589		errorgorn	Autobus (COCI22_autobus)	C++17	70 / 70	187 ms	9588 KiB

Main

//雪花飄飄北風嘯嘯
//天地一片蒼茫

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define int long long
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ii,ll>
#define fi first
#define se second
#define endl '\n'
#define debug(x) cout << #x << ": " << x << endl

#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define lb lower_bound
#define ub upper_bound

#define rep(x,start,end) for(auto x=(start)-((start)>(end));x!=(end)-((start)>(end));((start)<(end)?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()

#define indexed_set tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>
//change less to less_equal for non distinct pbds, but erase will bug

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

int n,m,q,k;
int w[75][75];
int dist[75][75][75];

signed main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin.exceptions(ios::badbit | ios::failbit);
	
	cin>>n>>m;
	
	memset(w,1,sizeof(w));
	memset(dist,1,sizeof(dist));
	
	rep(x,0,75) dist[0][x][x]=0,w[x][x]=0;
	
	int a,b,c;
	
	rep(x,0,m){
		cin>>a>>b>>c;
		a--,b--;
		w[a][b]=min(w[a][b],c);
	}
	
	rep(i,0,74) rep(x,0,n) rep(y,0,n) rep(z,0,n){
		dist[i+1][x][z]=min(dist[i+1][x][z],dist[i][x][y]+w[y][z]);
	}
	
	cin>>k>>q;
	k=min(k,n);
	
	while (q--){
		cin>>a>>b;
		a--,b--;
		
		cout<<(dist[k][a][b]>1e9?-1:dist[k][a][b])<<endl;
	}
}

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 15 / 15