Submission #825862

#	Time	Username	Problem	Language	Result	Execution time	Memory
825862		AlphaMale06	Monthly railway pass (LMIO18_menesinis_bilietas)	C++14	10 / 100	437 ms	262144 KiB

menesinis_bilietas

#include <bits/stdc++.h>

using namespace std;

#define F first
#define S second
#define mp make_pair
#define pb push_back

const int N = 5000005;
int p[N];
int sz[N];
set<int> reps;
set<pair<int, int>, less<pair<int, int>>> adj[N];
vector<pair<int, int>> paid;

void make(int v){p[v]=v; sz[v]=1;}

int rep(int v){
    if(p[v]==v)return v;
    return p[v]=rep(p[v]);
}

void unite(int v, int u){
    v=rep(v);
    u=rep(u);
    if(u==v)return;
    if(sz[u]>sz[v]){
        swap(u, v);
    }
    p[v]=u;
    sz[u]+=sz[v];
    reps.erase(reps.find(v));
}



int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    for(int i=1; i<=n; i++){
        make(i);
        reps.insert(i);
    }
    for(int i=0; i< m; i++){
        int x, y;
        char a;
        cin >> x >> y >> a;
        if(a=='T'){
            unite(x, y);
        }
        else paid.pb(mp(x, y));
    }
    for(int i=0; i< paid.size(); i++){
        int x=paid[i].F;
        int y=paid[i].S;
        x=rep(x);
        y=rep(y);
        int mn=min(x, y);
        int mx=max(x, y);
        adj[x].insert(mp(mn, mx));
        adj[y].insert(mp(mn, mx));
    }
    int ans=0;
    for(auto it = reps.begin(); it!=reps.end(); it++){
        int node=*it;
        if(adj[node].size()==reps.size()-1){
            ans+=sz[node];
        }
    }
    cout << ans << '\n';
}

Compilation message (stderr)

menesinis_bilietas.cpp: In function 'int main()':
menesinis_bilietas.cpp:57:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for(int i=0; i< paid.size(); i++){
      |                  ~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 6
• Subtask 3: 0 / 30
• Subtask 4: 0 / 35
• Subtask 5: 0 / 19