ЗОШ 1-k bfs

#include <iostream>
#include <cmath>
#include <vector>
#include <queue>
#include <algorithm>
#include <string>
#include <stack>
#include <set>
#include <map>
#define pii pair <int,int>
using namespace std;
using ll = long long;
using ld = long double;
using db = double;
void cv(vector <int> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}

void cvl(vector <ll> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}


void cvv(vector <vector <int> > &v){
    for (auto x: v) cv(x);
    cout<<"\n";
}

int n,m;

vector <int> d;



struct ed{
    int fr, to;
    ld w;
};

vector <vector <ed>> G;

map

const int inf = 2e9;

void readG(){
    cin>>n>>m;
    G.resize(n);
    d.assign(n, inf);
    for (int i=0;i<m;++i){
        int a,b;
        ld w;
        cin>>a>>b>>w;
        a--; b--;
        w /= 1000.0;
        ed any = {a, b, w};
        G[a].push_back(any);
    }
}

void shG(){
    cout<<"G\n";
    for (int i=0;i<n;++i){
        cout<<i+1<<"\n";
        for (auto x: G[i]){
            cout<<x.to+1<<' '<<fixed<<x.w<<"\n";
        }
        cout<<"\n";
    }
}



void fndWaves(int s){

    d[s] = 0;

}


int main()
{
    ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cout.precision(5);
	//cin>>n>>m;
	readG();
	//shG();

}
/*
5 5
1 2 2000
1 3 1000
1 4 1200
2 3 1500
3 4 1500

4
1 5
2 4
3 3
1 2

*/