Submission #866404

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
866404	2023-10-26 04:59:32	JellyTheOctopus	Subway (info1cup19_subway)	C++17	0 / 100	1 ms	464 KiB

subway

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#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
const int MOD = 1e9+7;
const int MAX_N = 44721;
int K;
int tri[MAX_N+1];
int cnt[MAX_N+1];
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> K;
    if (K == 0) {
        cout << 0 << "\n";
        return 0;
    }
    for (int i = 1; i <= MAX_N; i++) {
        tri[i] = i*(i+1)/2;
    }
    int N = 1;
    for (int i = MAX_N; i >= 1; i--) {
        cnt[i] = K / tri[i];
        N += i*cnt[i];
        K %= tri[i];
    }
 
 
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• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50