Submission #1000572

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Source Code Expand

#include <iostream>
#include <vector>
#include <cstdio>
#include <algorithm>
#include <set>
#include <map>
#include <cassert>
#include <numeric>
#include <string>
#include <cstring>
#include <cmath>
using namespace std;

#ifdef LOCAL
	#define eprintf(...) fprintf(stderr, __VA_ARGS__)
#else
	#define eprintf(...) 42
#endif

typedef long long int int64;

const int MOD = (int) 1e9 + 7;

void smul(int &a, int b)
{
	a = (a * 1LL * b) % MOD;
}
const int N = (int) 1e5 + 100;
int a[N], b[N];


int main(int,  char **)
{
#ifdef LOCAL
	freopen("input.txt", "r", stdin);
//	freopen("output.txt", "w", stdout);
#endif


	int n;
	scanf("%d", &n);
	for (int i = 0; i < n; i++)
		scanf("%d", &a[i] );
	for (int i = 0; i < n; i++)
		scanf("%d", &b[i] );
	sort(a, a + n);
	sort(b, b + n);

	int pa = 0, pb = 0;
	
	int cnt = 0;

	int ans = 1;
	a[n] = b[n] = (int) 1e9 + 7;
	while (pa < n || pb < n)
	{
		if (a[pa] < b[pb] )
		{
			if (cnt < 0)
				smul(ans, -cnt);
			cnt++;
			pa++;
		}
		else
		{
			if (cnt > 0)
				smul(ans, cnt);
			cnt--;
			pb++;
		}
	}

	printf("%d\n", ans);

	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main(int, char**)’:
./Main.cpp:41:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:43:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i] );
                      ^
./Main.cpp:45:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &b[i] );
                      ^

Judge Result