Submission #369261

#	Time	Username	Problem	Language	Result	Execution time	Memory
369261		notrichardpeng	A Huge Tower (CEOI10_tower)	C++11	25 / 100	1042 ms	4600 KiB

tower

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define pi pair<int, int>
#define endl '\n'
 
void setIO(string name = "") { 
    ios_base::sync_with_stdio(0); 
	cin.tie(0);     
    if (name.length()) {
        freopen((name+".in").c_str(), "r", stdin); 
        freopen((name+".out").c_str(), "w", stdout);
    }
}

int n, d;
vector<int> A;
const int MOD = 1e9 + 9;

int main(){			 
    setIO("");
    cin >> n >> d;
    for(int i = 0; i < n; i++){
        int a; cin >> a;
        A.push_back(a);
    }

    sort(A.begin(), A.end(), greater<int>());
    int l = 0, r = 0;
    int res = 1;

    while(r < n){
        while(r < n && A[l] - A[r] <= d) r++;
        int diff = r - l;
        while(diff > 1){
            res *= diff;
            res %= MOD;
            diff--;
        }
                
        while(l < r && A[l] - A[r] > d) l++;                
    }

    cout << res << endl;


    return 0;
}

Compilation message (stderr)

tower.cpp: In function 'void setIO(std::string)':
tower.cpp:12:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   12 |         freopen((name+".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tower.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   13 |         freopen((name+".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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