제출 #407778

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
407778		balbit	Toy Train (IOI17_train)	C++14	23 / 100	616 ms	1628 KiB

train

#include "train.h"

#include <bits/stdc++.h>
using namespace std;
//#define BALBIT
#define ll long long
#define y1 zck_is_king
#define pii pair<int, int>
#define ull unsigned ll
#define f first
#define s second
#define ALL(x) x.begin(),x.end()
#define SZ(x) (int)x.size()
#define SQ(x) (x)*(x)
#define MN(a,b) a = min(a,(__typeof__(a))(b))
#define MX(a,b) a = max(a,(__typeof__(a))(b))
#define pb push_back
#define REP(i,n) for (int i = 0; i<n; ++i)
#define RREP(i,n) for (int i = n-1; i>=0; --i)
#define REP1(i,n) for (int i = 1; i<=n; ++i)
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()), c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
#ifdef BALBIT
#define IOS()
#define bug(...) fprintf(stderr,"#%d (%s) = ",__LINE__,#__VA_ARGS__),_do(__VA_ARGS__);
template<typename T> void _do(T &&x){cerr<<x<<endl;}
template<typename T, typename ...S> void _do(T &&x, S &&...y){cerr<<x<<", ";_do(y...);}
#else
#define IOS() ios_base::sync_with_stdio(0);cin.tie(0);
#define endl '\n'
#define bug(...)
#endif

const int iinf = 1e9+10;
const ll inf = 1ll<<60;
const ll mod = 1e9+7 ;


void GG(){cout<<"0\n"; exit(0);}

ll mpow(ll a, ll n, ll mo = mod){ // a^n % mod
    ll re=1;
    while (n>0){
        if (n&1) re = re*a %mo;
        a = a*a %mo;
        n>>=1;
    }
    return re;
}

ll inv (ll b, ll mo = mod){
    if (b==1) return b;
    return (mo-mo/b) * inv(mo%b,mo) % mo;
}

const int maxn = 5e3+5;

bool win[maxn];
int safe[maxn]; // safe edges coming out of this node
vector<int> g[maxn];
vector<int> rg[maxn];


std::vector<int> who_wins(std::vector<int> who, std::vector<int> station, std::vector<int> UU, std::vector<int> VV) {
	int n = SZ(who);
	std::vector<int> res(n);
    REP(i,SZ(UU)) {
        g[UU[i]].pb(VV[i]);
        rg[VV[i]].pb(UU[i]);
    }
//    return res;
    REP(round, 3)
    REP(T, n) {
        if (res[T]) continue;
        // T is target node
        if (!station[T]) continue;
        // who = 1: any is required to win
        REP(i,n) safe[i] = SZ(g[i]);
        memset(win, 0, sizeof win);
        win[T] = 1;
        queue<int> q;
        REP(i,n) if (res[i] || i==T) q.push(i);
        while (!q.empty() ){
            int v = q.front(); q.pop();
            for (int u : rg[v]) {
                if (!win[u]) {
                    if (who[u] == 1) {
                        // any required
                        bug(u, who[u]);
                        win[u] = 1; q.push(u);
                    }else{
                        -- safe[u];
                        if (safe[u] == 0) {
                            q.push(u);
                            win[u] = 1;
                        }
                    }
                }
            }
        }
//        continue;
        bool ok = 0;
        if (who[T] == 1) {
            // any required
            for (int u : g[T]) {
                if (win[u]) {
                    ok = 1; break;
                }
            }
        }else{
            ok = 1;
            for (int u : g[T]) {
                if (!win[u]) {
//                    bug(T, u, win[u]);
                    ok=0; break;
                }
            }
        }
//        bug(T, ok);
        if (ok) {
            REP(i,n) {
//                bug(i, win[i]);
                if (win[i]) res[i] = 1;
            }
        }
    }
	return res;
}



/*
2 4
0 1
1 0
0 0
0 1
1 0
1 1

*/

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