Submission #127717

#	Time	Username	Problem	Language	Result	Execution time	Memory
127717		BThero	Asceticism (JOI18_asceticism)	C++17	4 / 100	1079 ms	384 KiB

asceticism

// Why am I so dumb? :c
// chrono::system_clock::now().time_since_epoch().count()

//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>

#define pb push_back
#define mp make_pair

#define all(x) (x).begin(), (x).end()

#define fi first
#define se second

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;   
template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

int perm[15];

int n, k;

void solve() {
    scanf("%d %d", &n, &k);

    for (int i = 1; i <= n; ++i) {
        perm[i] = i;
    }

    int ans = 0;

    do {
        int a = 1, b = 0;

        for (int i = 1; i <= n; ++i) {
            if (perm[i] < b) {
                ++a;
            }
            
            b = perm[i];
        }

        if (a == k) {
            ++ans;
        }
    }
    while (next_permutation(perm + 1, perm + n + 1));

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

int main() {
    int tt = 1;

    while (tt--) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

asceticism.cpp: In function 'void solve()':
asceticism.cpp:30:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 0 / 20
• Subtask 3: 0 / 25
• Subtask 4: 0 / 51