/**
⚡⚡ ⚡⚡ ⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡⚡
⚡⚡ ⚡⚡ ⚡⚡⚡⚡ ⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡
⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡
⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡
⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡⚡⚡⚡⚡ ⚡⚡⚡⚡⚡ ⚡⚡ ⚡⚡ ⚡⚡
**/
#include<bits/stdc++.h>
using namespace std;
#define fto(i, a, b) for(int i = a; i <= b; ++i)
#define fdto(i, a, b) for(int i = a; i >= b; --i)
#define bugarr(a, i, j) cout << #a << "{" << i << "..." << j << "}:"; fto(k, i, j-1) cout << a[k] << ", "; cout << a[j] << endl;
#define ll long long
#define db double
#define ldb long double
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define vt vector
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define trav(i, a) for(auto &i : a)
#define sz(a) (int)a.size()
#define pi(a, b) pair<a, b>
#define fast ios::sync_with_stdio(false); cin.tie(0)
void setIO(string s) {
if (sz(s) != 0) {
freopen((s+".inp").c_str(),"r",stdin);
freopen((s+".out").c_str(),"w",stdout);
}
}
void setIOusaco(string s) {
if (sz(s) != 0) {
freopen((s+".in").c_str(),"r",stdin);
freopen((s+".out").c_str(),"w",stdout);
}
}
template<typename T, typename V>
bool ckmin(T &a, V b) {return (b < a)? a = b, true : false;}
template<typename T, typename V>
bool ckmax(T &a, V b) {return (b > a)? a = b, true : false;}
const int maxN = 20;
const int oo = 998244353;
void print(int x) {cout << x;}
void print(long long x) {cout << x;}
void print(unsigned x) {cout << x;}
void print(unsigned long long x) {cout << x;}
void print(double x) {cout << fixed << x;}
void print(long double x) {cout << fixed << x;}
void print(char x) {cout << "'" << x << "'";}
void print(string x) {cout << '"' << x << '"';}
void print(bool x) {cout << (x ? "true" : "false");}
template<typename T, typename V>
void print(const pair<T, V> &x) {cout << '{'; print(x.ff); cout << ", "; print(x.ss); cout << '}';}
template<typename T>
void print(const T &x) {int f = 0; cout << '{'; for (auto &i: x) cout << (f++ ? ", " : ""), print(i); cout << "}";}
void _print() {cout << "]" << endl;}
template <typename T, typename... V>
void _print(T t, V... v) {print(t); if (sizeof...(v)) cout << ", "; _print(v...);}
#ifdef TAP
#define bug(x...) cout << "[" << #x << "] = ["; _print(x)
#else
#define bug(x...)
#endif
int main() {
#ifndef TAP
setIO("");
//setIOusaco("CEOI19_amusementpark");
#endif
fast;
int n, m;
cin >> n >> m;
vt<pi(int, int)> edges;
fto(i, 1, m) {
int u, v;
cin >> u >> v;
edges.pb({u, v});
}
vt<int> a(n);
iota(all(a), 0);
set<ll> exist;
int ans = 0;
do {
ll sth = 0;
fto(i, 0, m-1) {
if (a[edges[i].ff] > a[edges[i].ss]) sth |= (1LL<<i);
}
if (exist.find(sth) == exist.end()) {
if ((ans += __builtin_popcountll(sth)) > oo) ans -= oo;
exist.insert(sth);
}
} while(next_permutation(all(a)));
cout << ans << '\n';
return 0;
}
Compilation message
amusementpark.cpp: In function 'void setIO(std::string)':
amusementpark.cpp:34:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
34 | freopen((s+".inp").c_str(),"r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
amusementpark.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
35 | freopen((s+".out").c_str(),"w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
amusementpark.cpp: In function 'void setIOusaco(std::string)':
amusementpark.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
41 | freopen((s+".in").c_str(),"r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
amusementpark.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
42 | freopen((s+".out").c_str(),"w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
204 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
