Submission #814940

#	Time	Username	Problem	Language	Result	Execution time	Memory
814940		jajco	Jail (JOI22_jail)	C++17	21 / 100	5064 ms	312 KiB

jail

#include <ios>
#include <vector>
#include <algorithm>
#include <functional>
#define REP(i, n) for (int i=0; i<n; ++i)
typedef std::vector <int> vi;
int main(){
    int q;
    scanf("%d", &q);
    while (q--){
        int n;
        scanf("%d", &n);
        std::vector <vi> pol(n+1, vi());
        REP(i, n-1){
            int p,k;
            scanf("%d%d", &p, &k);
            pol[p].emplace_back(k);
            pol[k].emplace_back(p);
        }
        int m;
        scanf("%d", &m);
        vi pocz(m),kon(m),perm;
        REP(i, m){
            scanf("%d%d", &pocz[i], &kon[i]);
            perm.emplace_back(i);
        }
        bool czy=0;
        while (1){
            std::vector <bool> zaj(n+1, 0);
            for (int i : pocz)
                zaj[i]=1;
            std::function <bool(int, int, int)> DFS=[&](
                    int i, int ojc, int d){
                if (i==d)
                    return true;
                bool r=0;
                for (int j : pol[i])
                    if (j!=ojc&&!zaj[j])
                        r|=DFS(j, i, d);
                return r;
            };
            bool w=1;
            for (int i : perm){
                if (!(w&=DFS(pocz[i], pocz[i], kon[i])))
                    break;
                zaj[pocz[i]]=0,zaj[kon[i]]=1;
            }
            czy|=w;
            if (czy||!std::next_permutation(perm.begin(), perm.end()))
                break;
        }
        printf(czy ? "Yes\n" : "No\n");
    }
}

Compilation message (stderr)

jail.cpp: In function 'int main()':
jail.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
jail.cpp:12:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         scanf("%d", &n);
      |         ~~~~~^~~~~~~~~~
jail.cpp:16:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |             scanf("%d%d", &p, &k);
      |             ~~~~~^~~~~~~~~~~~~~~~
jail.cpp:21:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         scanf("%d", &m);
      |         ~~~~~^~~~~~~~~~
jail.cpp:24:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |             scanf("%d%d", &pocz[i], &kon[i]);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 5 / 5
• Subtask 3: 16 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23