Submission #656246

#	Time	Username	Problem	Language	Result	Execution time	Memory
656246		bojackduy	Bitaro’s Party (JOI18_bitaro)	C++14	0 / 100	37 ms	71116 KiB

bitaro

#include <iostream>
#include <queue>
#include <stack>
#include <algorithm>
#include <string.h>
#include <functional>
#include <numeric>
#define task ""
#define size() size() * 1ll 
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define pii pair<int, int>
#define fi first
#define se second
#define MASK(x) (1LL << (x))
#define BIT(x,i) (((x) >> (i)) & 1)
#define numbit(x) __builtin_popcountll(x)

using namespace std;

typedef vector<int> vi;
typedef vector<pii> vii;
typedef long long ll;

template<class t>
bool mini(t &x,t y) {
    if (y < x) {
       x = y;
       return 1;
    }
return 0;
}
template<class t>
bool maxi(t &x,t y) {
    if (x < y) {
       x = y;
       return 1;
    }
return 0;
}

const int N = 1e6 + 1;
const int M = 1e3 + 1;
const long long mod = 1e9 + 7;
const long long oo = 1e18 + 7;

int n, m, q, k;
int c[N];
bool vis[N], take[N];
vi a[N], b[N];
vii d[N];
void solve(int test = -1) {
    cin >> n >> m >> q;
    k = __builtin_sqrt(n) + 1;
    for (int i = 1; i <= m; i++) {
        int x, y;
        cin >> x >> y;
        a[x].pb(y);
        b[y].pb(x);
    }
    for (int u = 1; u <= n; u++) {
        for (int v: b[u]) {
            vii best;
            d[v].pb(pii(0, v));
            int i = 0, j = 0;
            while (best.size() < k && (i < d[v].size() || j < d[u].size())) {
                if (j == d[u].size() || (i < d[v].size() && d[v][i].fi + 1 >= d[u][i].fi)) {
                    d[v][i].fi++;
                    best.pb(d[v][i]);
                    vis[d[v][i].se] = 1;
                    d[v][i].fi--;
                    i++;
                } else {
                    best.pb(d[u][j]);
                    vis[d[u][j].se] = 1;
                    j++;
                }
                while (i < d[v].size() && vis[d[v][i].se]) i++;
                while (j < d[u].size() && vis[d[u][j].se]) j++;
            }
            d[v].pop_back();
            for (pii x: best) vis[x.se] = 0;
            swap(d[u], best);
        }
    }
    while (q--) {
        int t, y;
        cin >> t >> y;
        for (int i = 1; i <= y; i++) {
            int x;
            cin >> x;
            c[i] = x;
            take[x] = 1;
        }
        int res = -1;
        if (y <= k) {
            for (pii x: d[t]) {
                if (!take[x.se]) {
                    res = x.fi;
                    break;
                }
            }
            if (!take[t]) res = max(res, 0);
        } else {
            vi best(n + 1, 0);
            for (int i = 1; i <= y; i++) best[c[i]] = -1;

            for (int i = 1; i < t; i++) {
                if (best[i] == -1) continue;
                for (int v: a[i]) if (best[v] != -1) {
                    maxi(best[v], best[i] + 1);
                }
            }
            res = best[t];
        }
        cout << res << '\n';
        for (int i = 1; i <= y; i++) take[c[i]] = 0;
    }
}

int32_t main()  {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    // freopen(task".inp", "r", stdin);
    // freopen(task".out", "w", stdout);

    int T = 1;
    // cin >> T;
    for (int i = 1; i <= T; i++) {
        solve(i);
    }
return 0;
}
/*

*/

Compilation message (stderr)

bitaro.cpp: In function 'void solve(int)':
bitaro.cpp:66:32: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'int' [-Wsign-compare]
   66 |             while (best.size() < k && (i < d[v].size() || j < d[u].size())) {
      |                    ~~~~~~~~~~~~^~~
bitaro.cpp:66:42: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   66 |             while (best.size() < k && (i < d[v].size() || j < d[u].size())) {
      |                                          ^
bitaro.cpp:66:61: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   66 |             while (best.size() < k && (i < d[v].size() || j < d[u].size())) {
      |                                                             ^
bitaro.cpp:67:23: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   67 |                 if (j == d[u].size() || (i < d[v].size() && d[v][i].fi + 1 >= d[u][i].fi)) {
      |                       ^
bitaro.cpp:67:44: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   67 |                 if (j == d[u].size() || (i < d[v].size() && d[v][i].fi + 1 >= d[u][i].fi)) {
      |                                            ^
bitaro.cpp:78:26: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   78 |                 while (i < d[v].size() && vis[d[v][i].se]) i++;
      |                          ^
bitaro.cpp:79:26: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   79 |                 while (j < d[u].size() && vis[d[u][j].se]) j++;
      |                          ^

• Subtask 1: 0 / 7
• Subtask 2: 0 / 7
• Subtask 3: 0 / 86