Submission #1091985

#TimeUsernameProblemLanguageResultExecution timeMemory
1091985thangdz2k7Sparklers (JOI17_sparklers)C++17
0 / 100
2 ms1444 KiB
// author : thembululquaUwU // 3.9.2024 #include <bits/stdc++.h> #define int long long #define pb push_back #define fi first #define se second #define endl '\n' using namespace std; using ll = long long; using ii = pair <int, int>; using vi = vector <int>; const int N = 1e3 + 5; const int mod = 1e9 + 7; void maxl(auto &a, auto b) {a = max(a, b);} void minl(auto &a, auto b) {a = min(a, b);} int n, k, t, x[N]; bool dp[N][N]; bool check(ll s) { memset(dp, 0, sizeof dp); dp[k][k] = 1; for (int len = 2; len <= n; ++ len) { for (int l = 1; l <= n; ++ l) { int r = l + len - 1; if (r > n) { break; } dp[l][r] = ((dp[l + 1][r] || dp[l][r - 1]) && (x[r] - x[l]) <= 2 * s * (r - l) * t); } } return dp[1][n]; } void solve(){ cin >> n >> k >> t; for (int i = 1; i <= n; ++ i) cin >> x[i]; int lo = 1, hi = x[n] / t + 1, ans = hi; while (lo <= hi){ int mid = lo + hi >> 1; if (check(mid)) ans = mid, hi = mid - 1; else lo = mid + 1; } cout << ans; } signed main(){ if (fopen("pqh.inp", "r")){ freopen("pqh.inp", "r", stdin); freopen("pqh.out", "w", stdout); } ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int t = 1; // cin >> t; while (t --) solve(); return 0; }

Compilation message (stderr)

sparklers.cpp:19:11: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   19 | void maxl(auto &a, auto b) {a = max(a, b);}
      |           ^~~~
sparklers.cpp:19:20: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   19 | void maxl(auto &a, auto b) {a = max(a, b);}
      |                    ^~~~
sparklers.cpp:20:11: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void minl(auto &a, auto b) {a = min(a, b);}
      |           ^~~~
sparklers.cpp:20:20: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void minl(auto &a, auto b) {a = min(a, b);}
      |                    ^~~~
sparklers.cpp: In function 'void solve()':
sparklers.cpp:46:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |         int mid = lo + hi >> 1;
      |                   ~~~^~~~
sparklers.cpp: In function 'int main()':
sparklers.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen("pqh.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen("pqh.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
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