Submission #301091

#	Time	Username	Problem	Language	Result	Execution time	Memory
301091		evpipis	A Huge Tower (CEOI10_tower)	C++11	100 / 100	181 ms	8824 KiB

tower

#include <bits/stdc++.h>
using namespace std;

const int len = 1e6+5, mod = 1e9+9;
int arr[len];

int mul(int a, int b){
    return (a*1LL*b)%mod;
}

int main(){
    int n, k;
    scanf("%d %d", &n, &k);
    for (int i = 0; i < n; i++)
        scanf("%d", &arr[i]);

    assert(n < len);
    sort(arr, arr+n);

    int ans = 1;
    for (int i = 0, j = 0; i < n; i++){
        while (arr[i] > arr[j]+k)
            j++;

        ans = mul(ans, i-j+1);
    }

    printf("%d\n", ans);
    return 0;
}

Compilation message (stderr)

tower.cpp: In function 'int main()':
tower.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |     scanf("%d %d", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~
tower.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |         scanf("%d", &arr[i]);
      |         ~~~~~^~~~~~~~~~~~~~~

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