Submission #1036634

#TimeUsernameProblemLanguageResultExecution timeMemory
1036634LudisseyHacker (BOI15_hac)C++17
100 / 100
24 ms8028 KiB
#include <bits/stdc++.h> using namespace std; namespace std { // https://judge.yosupo.jp/submission/193613 struct IOPre { static constexpr int TEN = 10, SZ = TEN * TEN * TEN * TEN; std::array<char, 4 * SZ> num; constexpr IOPre() : num{} { for (int i = 0; i < SZ; i++) for (int n = i, j = 3; j >= 0; j--) num[i * 4 + j] = n % TEN + '0', n /= TEN; } }; struct IO { #if !HAVE_DECL_FREAD_UNLOCKED #define fread_unlocked fread #endif #if !HAVE_DECL_FWRITE_UNLOCKED #define fwrite_unlocked fwrite #endif static constexpr int SZ = 1 << 17, LEN = 32, TEN = 10, HUNDRED = TEN * TEN, THOUSAND = HUNDRED * TEN, TENTHOUSAND = THOUSAND * TEN, MAGIC_MULTIPLY = 205, MAGIC_SHIFT = 11, MASK = 15, TWELVE = 12, SIXTEEN = 16; static constexpr IOPre io_pre = {}; std::array<char, SZ> input_buffer, output_buffer; int input_ptr_left, input_ptr_right, output_ptr_right; IO() : input_buffer{}, output_buffer{}, input_ptr_left{}, input_ptr_right{}, output_ptr_right{} {} IO(const IO&) = delete; IO(IO&&) = delete; IO& operator=(const IO&) = delete; IO& operator=(IO&&) = delete; ~IO() { flush(); } template<typename T> static constexpr bool is_char_v = std::is_same_v<T, char>; template<typename T> static constexpr bool is_bool_v = std::is_same_v<T, bool>; template<typename T> static constexpr bool is_string_v = std::is_same_v<T, std::string> || std::is_same_v<T, const char*> || std::is_same_v<T, char*> || std::is_same_v< std::decay_t<T>, char*>; template<typename T> static constexpr bool is_default_v = is_char_v<T> || is_bool_v<T> || is_string_v<T> || std::is_integral_v<T>; inline void load() { memmove(std::begin(input_buffer), std::begin(input_buffer) + input_ptr_left, input_ptr_right - input_ptr_left); input_ptr_right = input_ptr_right - input_ptr_left + fread_unlocked( std::begin(input_buffer) + input_ptr_right - input_ptr_left, 1, SZ - input_ptr_right + input_ptr_left, stdin); input_ptr_left = 0; } inline void read_char(char& c) { if (input_ptr_left + LEN > input_ptr_right) load(); c = input_buffer[input_ptr_left++]; } inline void read_string(std::string& x) { char c; while (read_char(c), c < '!') continue; x = c; while (read_char(c), c >= '!') x += c; } template<typename T> inline std::enable_if_t<std::is_integral_v<T>, void> read_int(T& x) { if (input_ptr_left + LEN > input_ptr_right) load(); char c = 0; do c = input_buffer[input_ptr_left++]; while (c < '-'); [[maybe_unused]] bool minus = false; if constexpr (std::is_signed<T>::value == true) if (c == '-') minus = true, c = input_buffer[input_ptr_left++]; x = 0; while (c >= '0') x = x * TEN + (c & MASK), c = input_buffer[input_ptr_left++]; if constexpr (std::is_signed<T>::value == true) if (minus) x = -x; } inline void skip_space() { if (input_ptr_left + LEN > input_ptr_right) load(); while (input_buffer[input_ptr_left] <= ' ') input_ptr_left++; } inline void flush() { fwrite_unlocked(std::begin(output_buffer), 1, output_ptr_right, stdout); output_ptr_right = 0; } inline void write_char(char c) { if (output_ptr_right > SZ - LEN) flush(); output_buffer[output_ptr_right++] = c; } inline void write_bool(bool b) { if (output_ptr_right > SZ - LEN) flush(); output_buffer[output_ptr_right++] = b ? '1' : '0'; } inline void write_string(const std::string& s) { for (auto x : s) write_char(x); } inline void write_string(const char* s) { while (*s) write_char(*s++); } inline void write_string(char* s) { while (*s) write_char(*s++); } template <typename T> inline std::enable_if_t< std::is_integral_v<T>, void> write_int(T x) { if (output_ptr_right > SZ - LEN) flush(); if (!x) { output_buffer[output_ptr_right++] = '0'; return; } if constexpr (std::is_signed_v<T>) if (x < 0) output_buffer[output_ptr_right++] = '-', x = -x; int i = TWELVE; std::array<char, SIXTEEN> buf{}; for (; x >= TENTHOUSAND; x /= TENTHOUSAND, i -= 4) memcpy(std::begin(buf) + i, std::begin(io_pre.num) + (x % TENTHOUSAND) * 4, 4); if (x < HUNDRED) { if (x < TEN) output_buffer[output_ptr_right++] = '0' + x; else { uint32_t q = (uint32_t(x) * MAGIC_MULTIPLY) >> MAGIC_SHIFT; uint32_t r = uint32_t(x) - q * TEN; output_buffer[output_ptr_right++] = '0' + q; output_buffer[output_ptr_right++] = '0' + r; } } else { if (x < THOUSAND) memcpy(std::begin(output_buffer) + output_ptr_right, std::begin(io_pre.num) + (x << 2) + 1, 3), output_ptr_right += 3; else memcpy(std::begin(output_buffer) + output_ptr_right, std::begin(io_pre.num) + (x << 2), 4), output_ptr_right += 4; } memcpy(std::begin(output_buffer) + output_ptr_right, std::begin(buf) + i + 4, TWELVE - i); output_ptr_right += TWELVE - i; } template <typename T_> std::enable_if_t<(is_default_v< std::remove_cv_t< std::remove_reference_t<T_> > >), IO&> operator<<(T_&& x) { using T = std::remove_cv_t< std::remove_reference_t<T_> >; if constexpr (is_bool_v<T>) write_bool(x); else if constexpr (is_string_v<T>) write_string(x); else if constexpr (is_char_v<T>) write_char(x); else if constexpr (std::is_integral_v<T>) write_int(x); return *this; } template<typename T> std::enable_if_t<(is_default_v<T> && !is_bool_v<T>), IO&> operator>>(T& x) { if constexpr (is_string_v<T>) read_string(x); else if constexpr (is_char_v<T>) read_char(x); else if constexpr (std::is_integral_v<T>) read_int(x); return *this; } IO* tie(std::nullptr_t) { return this; } void sync_with_stdio(bool) {} } io; } // namespace std using std::io; #define cin io #define cout io signed main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); int n; cin >> n; int half=((n+1)/2); vector<int> v(n*2,0); for (int i = 0; i < v.size(); i++) { if(i<n) { cin >> v[i]; v[i+n]=v[i]; } v[i]+=v[i-1]; } deque<int> queue; for (int i = 0; i < half; i++) { while(!queue.empty()&&v[queue.back()+half-1]-v[queue.back()-1]>(v[i+half-1]-v[i-1])) queue.pop_back(); queue.push_back(i); } int outp=v[queue.front()+half-1]-v[queue.front()-1]; for (int i = half; i < (n*2)-half; i++) { if(!queue.empty()&&queue.front()==i-half) queue.pop_front(); while(!queue.empty()&&v[queue.back()+half-1]-v[queue.back()-1]>(v[i+half-1]-v[i-1])) queue.pop_back(); queue.push_back(i); outp=max(v[queue.front()+half-1]-v[queue.front()-1], outp); } cout << outp << "\n"; return 0; }

Compilation message (stderr)

hac.cpp: In function 'int main()':
hac.cpp:181:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  181 |     for (int i = 0; i < v.size(); i++) {
      |                     ~~^~~~~~~~~~
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