Submission #1000570

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Source Code Expand

#include <cstdio>
#include <iostream>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <vector>
#include <map>
#include <set>
#include <string>
#include <cstdlib>
#include <ctime>
#include <deque>
using namespace std;

#define P 1000000007
int n, a[210000], tx[210000], ans, now;

bool cmp(int x, int y) {
	return a[x] < a[y];
}

int main() {
	ans = 1;
	scanf("%d", &n);
	for (int i = 1; i <= n; i++)
		scanf("%d", &a[i]);
	for (int i = 1; i <= n; i++)
		scanf("%d", &a[i + n]);
	for (int i = 1; i <= 2 * n; i++)
		tx[i]= i;
	sort(tx + 1, tx + 2 * n + 1, cmp);
	for (int i = 1; i <= 2 * n; i++) {
		if (now > 0 && tx[i] > n)
			ans = 1LL * ans * now % P, now -= 1;
		else if (now < 0 && tx[i] <= n)
			ans = 1LL * ans * (- now) % P, now += 1;
		else if (tx[i] <= n)
			now += 1;
		else
			now -= 1;
	}
	printf("%d\n", ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:24:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:26:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
                     ^
./Main.cpp:28:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i + n]);
                         ^

Judge Result