Submission #69131

#	Time	Username	Problem	Language	Result	Execution time	Memory
69131		Just_Solve_The_Problem	Port Facility (JOI17_port_facility)	C++11	10 / 100	940 ms	748 KiB

port_facility

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define eb emplace_back
#define ll long long
#define pii pair < int, int >
#define fr first
#define sc second
#define mk make_pair
#define sz(s) (int)s.size()
#define all(s) s.begin(), s.end()
#define OK puts("ok");
#define whatis(x) cerr << #x << " = " << x << endl;
#define pause system("pause");

const int N = (int)1e6 + 7;
const int inf = (int)1e9 + 7;

pii ar[N];
int st[30];
int ans;

main() {
  int n;
  scanf("%d", &n);
  assert(n <= 20);
  vector < int > v1(n + n + 1);
  for (int i = 0; i < n; i++) {
    scanf("%d %d", &ar[i].fr, &ar[i].sc);
    v1[ar[i].fr] = i;
    v1[ar[i].sc] = i + n;
  }
  for (int mask = 0; mask < (1 << n); mask++) {
    vector < int > stk[2];
    bool ok = 1;
    for (int i = 1; i <= n + n; i++) {
      int bit = (mask >> (v1[i] % n)) & 1;
      if (v1[i] >= n) {
        if (stk[bit].back() == v1[i] - n) {
          stk[bit].pop_back();
        } else {
          ok = 0;
        }
      } else {
        stk[bit].pb(v1[i]);
      }
    }
    ans += ok;
  }
  cout << ans;
}

Compilation message (stderr)

port_facility.cpp:25:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
port_facility.cpp: In function 'int main()':
port_facility.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
   ~~~~~^~~~~~~~~~
port_facility.cpp:31:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &ar[i].fr, &ar[i].sc);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 56
• Subtask 4: 0 / 22