Submission #1051815

#TimeUsernameProblemLanguageResultExecution timeMemory
1051815otariusAlternating Current (BOI18_alternating)C++17
0 / 100
7 ms1884 KiB
#include <bits/stdc++.h> #include <bits/extc++.h> using namespace __gnu_pbds; using namespace std; // #pragma GCC optimize("Ofast") // #pragma GCC optimize ("unroll-loops") // #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") #define ff first #define sc second #define pb push_back #define ll long long #define pll pair<ll, ll> #define pii pair<int, int> #define ull unsigned long long #define all(x) (x).begin(),(x).end() // #define int long long // #define int unsigned long long // #define ordered_set(T) tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update> // #define ordered_multiset(T) tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update> void open_file(string filename) { freopen((filename + ".in").c_str(), "r", stdin); freopen((filename + ".out").c_str(), "w", stdout); } // const ll mod = 1e9 + 7; // const ll mod = 998244353; const ll inf = 1e9; const ll biginf = 1e18; const int maxN = 1e5 + 25; void solve() { int n, m; cin >> n >> m; int a[m], b[m]; for (int i = 0; i < m; i++) cin >> a[i] >> b[i]; for (int i = 20; i < (1 << m); i++) { bool x[n + 1] = {}, y[n + 1] = {}; for (int j = 0; j < m; j++) { if ((i >> j) & 1) { if (a[j] <= b[j]) { for (int k = a[j]; k <= b[j]; k++) { x[k] = 1; } } else { for (int k = a[j]; k <= n; k++) x[k] = 1; for (int k = 1; k <= b[j]; k++) x[k] = 1; } } else { if (a[j] <= b[j]) { for (int k = a[j]; k <= b[j]; k++) { y[k] = 1; } } else { for (int k = a[j]; k <= n; k++) y[k] = 1; for (int k = 1; k <= b[j]; k++) y[k] = 1; } } } bool f = 1; for (int j = 1; j <= n; j++) { if (!x[j] || !y[j]) f = 0; } if (f || i == 20) { for (int j = 0; j < m; j++) { cout << (i >> j) % 2; } return; } } cout << "impossible"; } int32_t main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); int t = 1; // cin >> t; while (t--) { solve(); cout << '\n'; } return 0; }

Compilation message (stderr)

alternating.cpp: In function 'void open_file(std::string)':
alternating.cpp:26:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     freopen((filename + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
alternating.cpp:27:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     freopen((filename + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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