Submission #208537

#	Time	Username	Problem	Language	Result	Execution time	Memory
208537		eriksuenderhauf	Political Development (BOI17_politicaldevelopment)	C++11	100 / 100	430 ms	31088 KiB

politicaldevelopment

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define enl printf("\n")
#define case(t) printf("Case #%d: ", (t))
#define ni(n) scanf("%d", &(n))
#define nl(n) scanf("%lld", &(n))
#define nai(a, n) for (int i = 0; i < (n); i++) ni(a[i])
#define nal(a, n) for (int i = 0; i < (n); i++) nl(a[i])
#define pri(n) printf("%d\n", (n))
#define prl(n) printf("%lld\n", (n))
#define pii pair<int, int>
#define pil pair<int, long long>
#define pll pair<long long, long long>
#define vii vector<pii>
#define vil vector<pil>
#define vll vector<pll>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef cc_hash_table<int,int,hash<int>> ht;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> oset;
const double pi = acos(-1);
const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;
const int MAXN = 1e5 + 5;
const double eps = 1e-9;
set<int> adj[MAXN];
bool vis[MAXN];

int main() {
    int n, k;
    scanf("%d %d", &n, &k);
    priority_queue<pii, vii, greater<pii>> pq;
    for (int i = 0; i < n; i++) {
        int d;
        scanf("%d", &d);
        pq.push({d, i});
        for (int j = 0; j < d; j++) {
            int u;
            scanf("%d", &u);
            adj[i].insert(u);
        }
    }
    int ans = 1;
    while (!pq.empty()) {
        pii cur = pq.top(); pq.pop();
        int u = cur.se;
        if (vis[u]) 
            continue;
        vis[u] = 1;
        vi tmp = {u};
        for (auto it = adj[u].begin(); it != adj[u].end(); it++) {
            if (!vis[*it]) {
                pq.push({adj[*it].size() - 1, *it});
                tmp.pb(*it);
            }
        }
        bool mrk[11][11] = {};
        for (int i = 0; i < tmp.size(); i++) {
            mrk[i][i] = 1;
            for (int j = 0; j < tmp.size(); j++)
                if (i != j && adj[tmp[i]].find(tmp[j]) != adj[tmp[i]].end())
                    mrk[i][j] = 1;
        }
        int sz = tmp.size();
        for (int j = 1; j < (1 << sz); j += 2) {
            bool fl = 1;
            int cnt = 0;
            for (int l = 0; l < sz; l++) {
                if ((j >> l) % 2 == 0) continue;
                cnt++;
                for (int a = 0; a < sz; a++) {
                    if ((j >> a) % 2 == 0) continue;
                    if (mrk[l][a] == 0)
                        fl = 0;
                }
                if (fl == 0) break;
            }
            if (fl)
                ans = max(ans, cnt);
        }
        for (int j: tmp) {
            if (adj[j].find(u) != adj[j].end())
                adj[j].erase(adj[j].find(u));
        }
    }
    printf("%d\n", ans);
    return 0;
}

Compilation message (stderr)

politicaldevelopment.cpp: In function 'int main()':
politicaldevelopment.cpp:67:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < tmp.size(); i++) {
                         ~~^~~~~~~~~~~~
politicaldevelopment.cpp:69:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int j = 0; j < tmp.size(); j++)
                             ~~^~~~~~~~~~~~
politicaldevelopment.cpp:40:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~
politicaldevelopment.cpp:44:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &d);
         ~~~~~^~~~~~~~~~
politicaldevelopment.cpp:48:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &u);
             ~~~~~^~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 38 / 38
• Subtask 5: 23 / 23