Submission #1000584

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Source Code Expand

#ifdef DEBUG
#define _GLIBCXX_DEBUG
#endif

#include <bits/stdc++.h>

using namespace std;

typedef long double ld;
typedef long long ll;

#ifdef DEBUG
#define eprintf(...) fprintf(stderr, __VA_ARGS__), fflush(stderr)
#else
#define eprintf(...) ;
#endif

#define pb push_back
#define mp make_pair
#define sz(x) ((int) (x).size())
#define TASK "text"

const int inf = (int) 1.01e9;
const ld eps = 1e-9;
const ld pi = acos((ld) -1);

mt19937 mrand(random_device{} ()); 

int rnd(int x) {
  return mrand() % x;
}

void precalc() {
}

const int maxn = (int) 1e5 + 5, mod = (int) 1e9 + 7;
int n;
int a[maxn], b[maxn];

int read() {
  if (scanf("%d", &n) < 1) {
    return false;
  }
  for (int i = 0; i < n; i++) {
    scanf("%d", &a[i]);
  }
  for (int i = 0; i < n; i++) {
    scanf("%d", &b[i]);
  }
  return true;
}

void solve() {
  sort(a, a + n);
  sort(b, b + n);
  int cnta = 0, cntb = 0;
  int res = 1;
  for (int ia = 0, ib = 0; ia < n || ib < n;) {
    if (ia < n && (ib == n || a[ia] < b[ib])) {
      if (cntb) {
        res = ((long long) res * cntb) % mod;
        cntb--;
      } else {
        cnta++;
      }
      ia++;
    } else {
      if (cnta) {
        res = ((long long) res * cnta) % mod;
        cnta--;
      } else {
        cntb++;
      }
      ib++;
    }
  }
  printf("%d\n", res);
}

int main() {
  precalc();
#ifdef LOCAL
  assert(freopen(TASK ".in", "r", stdin));
  assert(freopen(TASK ".out", "w", stdout));
#endif
  while (true) {
    if (!read()) {
      break;
    }
    solve();
#ifdef DEBUG
    eprintf("Time %.2f\n", (double) clock() / CLOCKS_PER_SEC);
#endif
  }
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int read()’:
./Main.cpp:45:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &a[i]);
                       ^
./Main.cpp:48:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &b[i]);
                       ^

Judge Result