Submission #1110511

#TimeUsernameProblemLanguageResultExecution timeMemory
1110511cpptowinAmusement Park (CEOI19_amusementpark)C++17
42 / 100
3063 ms170700 KiB
#include <bits/stdc++.h> #define fo(i, d, c) for (int i = d; i <= c; i++) #define fod(i, c, d) for (int i = c; i >= d; i--) #define maxn 1000010 #define N 1010 #define fi first #define se second #define pb emplace_back #define en cout << "\n"; #define int long long #define inf (int)1e18 #define bitcount(x) __builtin_popcountll(x) #define pii pair<int, int> #define vii vector<pii> #define lb(x) x & -x #define bit(i, j) ((i >> j) & 1) #define offbit(i, j) (i ^ (1LL << j)) #define onbit(i, j) (i | (1LL << j)) #define vi vector<int> #define all(x) x.begin(), x.end() #define ss(x) (int)x.size() #define UNIQUE(v) v.erase(unique(all(v)), v.end()) template <typename T1, typename T2> bool minimize(T1 &a, T2 b) { if (a > b) { a = b; return true; } return false; } template <typename T1, typename T2> bool maximize(T1 &a, T2 b) { if (a < b) { a = b; return true; } return false; } using namespace std; const int nsqrt = 450; const int mod = 1e9 + 7; void add(int &x, int k) { x += k; x %= mod; if (x < 0) x += mod; } void del(int &x, int k) { x -= k; x %= mod; if (x < 0) x += mod; } int n, m; pii a[N]; int id[20],pos[20]; main() { #define name "TASK" if (fopen(name ".inp", "r")) { freopen(name ".inp", "r", stdin); freopen(name ".out", "w", stdout); } ios_base::sync_with_stdio(false); cin.tie(NULL); cin >> n >> m; fo(i, 0, m - 1) cin >> a[i].fi >> a[i].se; fo(i, 1, n) id[i] = i; set<int> st; do { fo(i,1,n) pos[id[i]] = i; int mask = 0; fo(i,0,m - 1) { auto [u,v] = a[i]; if(pos[u] > pos[v]) mask = onbit(mask,i); } st.insert(mask); } while (next_permutation(id + 1, id + n + 1)); int ans = 0; for(int it : st) ans += bitcount(it); cout << ans; }

Compilation message (stderr)

amusementpark.cpp:63:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   63 | main()
      | ^~~~
amusementpark.cpp: In function 'int main()':
amusementpark.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen(name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
amusementpark.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen(name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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