Submission #1308975

#	Time	Username	Problem	Language	Result	Execution time	Memory
1308975		aunn	A Huge Tower (CEOI10_tower)	C++20	100 / 100	87 ms	4484 KiB

tower

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vi = vector<int>;
using vll = vector<ll>;
#define sz(x) (int) (x).size()
using pi = pair<int,int>;

void setIO(string name = "") {
	cin.tie(0)->sync_with_stdio(0);
	if (sz(name)) {
		freopen((name + ".in").c_str(), "r", stdin);
		freopen((name + ".out").c_str(), "w", stdout);
	}
}
ll MOD = 1e9+9;
int main() {
	setIO();
    int n, d;
    cin >> n >> d;
    vi arr;
    for(int i = 0; i < n; i++){
        int inp; cin >> inp;
        arr.push_back(inp);
    }
    sort(arr.begin(), arr.end());
    ll ans = 1;
    for(int l = 0, r = 0; l < n; l++){
        while(r < n && arr[r] + d < arr[l]){
            r++;
        }
        ans = ans * (l-r+1) % MOD;
    }
    cout << ans;
}

Compilation message (stderr)

tower.cpp: In function 'void setIO(std::string)':
tower.cpp:12:24: 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:13:24: 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);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
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• Subtask 5: 5 / 5
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• Subtask 19: 5 / 5
• Subtask 20: 5 / 5