Submission #609584

#	Time	Username	Problem	Language	Result	Execution time	Memory
609584		HediChehaidar	Toy Train (IOI17_train)	C++17	0 / 100	454 ms	2256 KiB

train

#include "train.h"

#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd  pair<double,double>
#define vdd  vector<pdd>
#define dte  tuple<double , double , double>
using namespace std;
const int INF = 1000*1000*1000; // 1 e 9
const int MOD = 1e9 + 7;//998244353 ;
const double EPS = 0.000000001; // 1 e -9
const ll inf = (ll)1e18;

int n , m;
vi adj[5050];
vi rev[5050];
vi a , ch ;
vector<vi> scc;
vi no;
int idx[5050];
bool vis[5050];
bool nice[5050];
stack<int> st;
bool dfs3(int pos){
    if(nice[pos]) return true;
    if(vis[pos]) return false;
    vis[pos] = true;
    bool ans = false;
    for(auto c : adj[pos]) ans = ans || dfs3(c);
    return ans;
}
void dfs2(int pos){
    if(vis[pos]) return ;
    vis[pos] = true;
    no.pb(pos);
    idx[pos] = scc.size();
    for(auto c : rev[pos] ) dfs2(c);
}
void dfs(int pos){
    if(vis[pos]) return ;
    vis[pos] = true;
    for(auto c : adj[pos]) dfs(c);
    st.push(pos);
}
vi who_wins(vi A , vi R , vi u , vi v){
    n = A.size(); m = u.size(); a = A; ch = R;
    vi ans; for(int i = 0 ; i < n ; i++) ans.pb(0);
    for(int i = 0 ; i < m ; i++){
        adj[u[i]].pb(v[i]); rev[v[i]].pb(u[i]);
    }
    for(int i = 0 ; i < n ; i++) if(!vis[i]) dfs(i);
    memset(vis , 0 , sizeof vis);
    while(!st.empty()){
        int x = st.top(); st.pop() ; dfs2(x);
        scc.pb(no);
        no.clear();
    }
    for(int i = 0 ; i < n ; i++) if(ch[i] && scc[idx[i]].size() > 1) nice[i] = true;
    for(int i = 0 ; i < n ; i++) memset(vis , 0 , sizeof vis),ans[i] = dfs3(i);
    return ans;
}
/*int main(){
    //ifstream fin ("testing.txt");
    //ofstream fout ("output.txt");
    ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int nn , mm; cin>>nn>>mm;
    vi u(mm) , v(mm) , aa(nn) , cc(nn);
    for(int i = 0 ; i < nn ; i++) cin>>aa[i];
    for(int i = 0 ; i < nn ; i++) cin>>cc[i];
    for(int i = 0 ; i < mm ; i++) cin>>u[i]>>v[i];
    for(auto c : who_wins(aa , cc , u , v)  ) cout << c << " "; cout << "\n";
    return 0;
}*/
/*
6 11
0 1 1 1 0 1
0 1 0 0 1 1
0 0
1 1
2 2
3 3
4 4
5 5
0 1
1 2
2 3
3 4
4 5
*/
/*
    Think of : BS / DFS / BFS / SSSP / SCC / MSP / MAX FLOW / TOPSORT / LCA / MATRIX / DP(bitmask) / 2 POINTERS / SEG TREE / MATH / UN FIND / MO / HLD
    Read the statement CAREFULLY !!
    Make a GREADY APPROACH !!!! (start from highest / lowest)
    Make your own TESTS !!
    Be careful from CORNER CASES !
*/

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 11
• Subtask 4: 0 / 11
• Subtask 5: 0 / 12
• Subtask 6: 0 / 51