Submission #986894

#	Time	Username	Problem	Language	Result	Execution time	Memory
986894		hengliao	Synchronization (JOI13_synchronization)	C++17	40 / 100	8090 ms	26748 KiB

synchronization

#include<bits/stdc++.h>
using namespace std;

#define F first
#define S second
#define pb push_back
#define vll vector<ll>
#define pll pair<ll, ll>
typedef long long ll;

const ll mxN=1e5+5;
const ll inf=1e18;

vector<pll> adj[mxN];
vector<pll> tim[mxN];
vll tep[mxN];
ll n, m, q;

ll dfs(ll cur, ll edge, ll par, ll mx){
    if(par!=-1 && (tim[edge].empty() || tim[edge][0].F>=mx)){
        return 0;
    }
    pll it={inf, inf};
    if(par!=-1)
        it=*prev(upper_bound(tim[edge].begin(), tim[edge].end(), make_pair(mx, 0LL)));
    mx=min(mx, it.S);
    ll re=1;
    for(auto &[x, y]:adj[cur]){
        if(x==par) continue;
        re+=dfs(x, y, cur, mx);
    }
    return re;
}

void solve(){
	cin>>n>>m>>q;
    for(ll i=1;i<=n-1;i++){
        ll a, b;
        cin>>a>>b;
        adj[a].pb({b, i});
        adj[b].pb({a, i});
    }
    for(ll i=0;i<m;i++){
        ll a;
        cin>>a;
        tep[a].pb(i);
    }
    for(ll i=1;i<=n-1;i++){
        if(tep[i].size()%2==1){
            tep[i].pb(m);
        }
    }
    for(ll i=1;i<=n-1;i++){
        for(ll j=0;j<tep[i].size();j+=2){
            tim[i].pb({tep[i][j], tep[i][j+1]});
        }
    }

    for(ll rep=0;rep<q;rep++){
        ll tar;
        cin>>tar;
        cout<<dfs(tar, 0, -1, inf)<<'\n';
    }
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	solve();
	return 0;
}

Compilation message (stderr)

synchronization.cpp: In function 'void solve()':
synchronization.cpp:54:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |         for(ll j=0;j<tep[i].size();j+=2){
      |                    ~^~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 10 / 10
• Subtask 4: 0 / 20
• Subtask 5: 0 / 40