Submission #549603

#	Time	Username	Problem	Language	Result	Execution time	Memory
549603		Theo830	Keys (IOI21_keys)	C++17	37 / 100	120 ms	17996 KiB

keys

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = 1e9+7;
const ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<ll,ii>
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
vector<ll>exo[2005];
bool vis[2005];
bool visn[2005];
vector<ii>adj[2005];
ll res = 0;
vector<int>R;
void dfs(ll idx){
    res++;
    visn[idx] = 1;
    if(!vis[R[idx]]){
        vis[R[idx]] = 1;
        for(auto x:exo[R[idx]]){
            if(!visn[x]){
                dfs(x);
            }
        }
        exo[R[idx]].clear();
    }
    for(auto x:adj[idx]){
        if(vis[x.S]){
            if(!visn[x.F]){
                dfs(x.F);
            }
        }
        else{
            exo[x.S].pb(x.F);
        }
    }
}
std::vector<int> find_reachable(std::vector<int> r, std::vector<int> u, std::vector<int> v, std::vector<int> c) {
	std::vector<int> ans(r.size(), 1);
	ll n = r.size();
	ll m = u.size();
	R = r;
	f(i,0,m){
        adj[u[i]].pb(ii(v[i],c[i]));
        adj[v[i]].pb(ii(u[i],c[i]));
	}
	ll timi[n] = {0};
	ll mini = n + 100;
	f(i,0,n){
	    f(j,0,n){
            vis[j] = 0;
            visn[j] = 0;
            exo[j].clear();
	    }
	    res = 0;
	    dfs(i);
        timi[i] = res;
        mini = min(mini,timi[i]);
	}
    f(i,0,n){
        if(timi[i] != mini){
            ans[i] = 0;
        }
	}
	return ans;
}
/*
int main() {
    int n, m;
    assert(2 == scanf("%d%d", &n, &m));
    std::vector<int> r(n), u(m), v(m), c(m);
    for(int i=0; i<n; i++) {
        assert(1 == scanf("%d", &r[i]));
    }
    for(int i=0; i<m; i++) {
        assert(3 == scanf("%d %d %d", &u[i], &v[i], &c[i]));
    }
    fclose(stdin);

    std::vector<int> ans = find_reachable(r, u, v, c);

    for (int i = 0; i < (int) ans.size(); ++i) {
        if(i) putchar(' ');
        putchar(ans[i]+'0');
    }
    printf("\n");
    return 0;
}
*/

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 17 / 17
• Subtask 4: 0 / 30
• Subtask 5: 0 / 33