Submission #1300839

#TimeUsernameProblemLanguageResultExecution timeMemory
1300839baotoan655Sparklers (JOI17_sparklers)C++20
100 / 100
17 ms1752 KiB
#include <bits/stdc++.h> #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); } using namespace std; const int N = 1e5 + 5; int n, k, T; int X[N]; long long val[N]; bool chk(int S) { for(int i = 1; i <= n; ++i) { val[i] = 2LL * S * i * T - X[i]; } int curL = k, curR = k; int nl = k - 1, nr = k + 1; bool ok = true; while(ok) { ok = false; while(nl > 1 && val[nl] > val[curL] && val[nl] <= val[curR]) --nl; while(nr < n && val[curR] > val[nr] && val[curL] <= val[nr]) ++nr; if(nl >= 1 && val[nl] <= val[curL]) { curL = nl; --nl; ok = true; } if(nr <= n && val[curR] <= val[nr]) { curR = nr; ++nr; ok = true; } } if(nr <= n && val[curL] > val[nr]) return false; if(nl >= 1 && val[curR] < val[nl]) return false; int l = 1, r = n; nl = 2, nr = n - 1; ok = true; while(ok) { ok = false; while(val[nl] > val[l] && val[nl] <= val[r] && nl < k) ++nl; while(val[nr] < val[r] && val[nr] >= val[l] && nr > k) --nr; if(nl <= k && val[nl] <= val[l]) { l = nl; ++nl; ok = true; } if(nr >= k && val[nr] >= val[r]) { r = nr; --nr; ok = true; } } return curL <= l && r <= curR; } int main() { ios_base::sync_with_stdio(false); cin.tie(0), cout.tie(0); file("A") else file("task"); cin >> n >> k >> T; for(int i = 1; i <= n; ++i) cin >> X[i]; int l = 0, r = 1e9, mid, res = -1; while(l <= r) { mid = (l + r) >> 1; if(chk(mid)) r = (res = mid) - 1; else l = mid + 1; } cout << res << '\n'; return 0; }

Compilation message (stderr)

sparklers.cpp: In function 'int main()':
sparklers.cpp:2:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:60:5: note: in expansion of macro 'file'
   60 |     file("A") else file("task");
      |     ^~~~
sparklers.cpp:2:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:60:5: note: in expansion of macro 'file'
   60 |     file("A") else file("task");
      |     ^~~~
sparklers.cpp:2:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:60:20: note: in expansion of macro 'file'
   60 |     file("A") else file("task");
      |                    ^~~~
sparklers.cpp:2:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:60:20: note: in expansion of macro 'file'
   60 |     file("A") else file("task");
      |                    ^~~~

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