Submission #530619

#	Time	Username	Problem	Language	Result	Execution time	Memory
530619		Killer2501	Bitaro’s Party (JOI18_bitaro)	C++14	100 / 100	978 ms	215064 KiB

bitaro

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fi first
#define se second
using namespace std;
const int N = 1e5+5;
const int M = 250;
const int mod = 1e9+7;
const ll base = 75;
const int inf = 1e9;
int m, n, t, b[N], d[N], lab[N], q;
int k, a[N];
pii dp[N][M], cur[M];
int ans, tong;
vector<int> adj[N], g[N];
vector<int> vi;
string s[N];
bool vis[N];
bool cmp(const int& x, const int& y)
{
    return d[x] > d[y];
}
void fix(int l, int r)
{
    int i = 0, j = 0, sz = 0;
    while(i < a[l] || j < a[r])
    {
        if(j == a[r] || (i < a[l] && dp[l][i].fi+1 > dp[r][j].fi))
        {
            if(!vis[dp[l][i].se])
            {
                vis[dp[l][i].se] = true;
                cur[sz].fi = dp[l][i].fi+1;
                cur[sz].se = dp[l][i].se;
                ++sz;
                if(sz == M)break;
            }
            ++i;
        }
        else
        {
            if(!vis[dp[r][j].se])
            {
                vis[dp[r][j].se] = true;
                cur[sz] = dp[r][j];
                ++sz;
                if(sz == M)break;
            }
            ++j;
        }
    }
    a[r] = sz;
    swap(cur, dp[r]);
    for(int j = 0; j < sz; j ++)
        vis[dp[r][j].se] = false;
}
void sol()
{
    cin >> n >> m >> q;
    for(int i = 1; i <= m; i ++)
    {
        int x, y;
        cin >> x >> y;
        adj[y].pb(x);
        g[x].pb(y);
    }
    for(int i = 1; i <= n; i ++)
    {
        dp[i][0].fi = 0;
        dp[i][0].se = i;
        a[i] = 1;
        for(int v: adj[i])fix(v, i);
    }
    while(q -- > 0)
    {
        cin >> k >> n;
        for(int i = 1; i <= n; i ++)
        {
            cin >> b[i];
            vis[b[i]] = true;
        }
        if(dp[k][0].fi == -1)cout << -1 << '\n';
        else
        {
            ans = -1;
            if(n >= M)
            {
                for(int u = 1; u <= k; u ++)
                {
                    if(vis[u])d[u] = -1;
                    else d[u] = 0;
                }
                for(int u = 1; u <= k; u ++)
                {
                    if(d[u] == -1)continue;
                    for(int v: g[u])d[v] = max(d[v], d[u]+1);
                }
                ans = d[k];

            }
            else
            {
                for(int i = 0; i < a[k]; i ++)
                {
                    if(!vis[dp[k][i].se])
                    {
                        ans = dp[k][i].fi;
                        break;
                    }
                }
            }
            cout << ans << '\n';
        }
        for(int i = 1; i <= n; i ++)vis[b[i]] = false;
    }
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "test"
    if(fopen(task".inp", "r"))
	{
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}
    int test = 1;
    //cin >> test;
    while(test -- > 0)sol();
    return 0;
}

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:130:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  130 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:131:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  131 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 86 / 86