#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; using lint = long long; using pint = pair; using plint = pair; struct fast_ios { fast_ios(){ cin.tie(nullptr), ios::sync_with_stdio(false), cout << fixed << setprecision(20); }; } fast_ios_; #define ALL(x) (x).begin(), (x).end() #define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i=i##_begin_;i--) #define REP(i, n) FOR(i,0,n) #define IREP(i, n) IFOR(i,0,n) template bool chmax(T &m, const T q) { return m < q ? (m = q, true) : false; } template bool chmin(T &m, const T q) { return m > q ? (m = q, true) : false; } const std::vector> grid_dxs{{1, 0}, {-1, 0}, {0, 1}, {0, -1}}; int floor_lg(long long x) { return x <= 0 ? -1 : 63 - __builtin_clzll(x); } template T1 floor_div(T1 num, T2 den) { return (num > 0 ? num / den : -((-num + den - 1) / den)); } template std::pair operator+(const std::pair &l, const std::pair &r) { return std::make_pair(l.first + r.first, l.second + r.second); } template std::pair operator-(const std::pair &l, const std::pair &r) { return std::make_pair(l.first - r.first, l.second - r.second); } template std::vector sort_unique(std::vector vec) { sort(vec.begin(), vec.end()), vec.erase(unique(vec.begin(), vec.end()), vec.end()); return vec; } template int arglb(const std::vector &v, const T &x) { return std::distance(v.begin(), std::lower_bound(v.begin(), v.end(), x)); } template int argub(const std::vector &v, const T &x) { return std::distance(v.begin(), std::upper_bound(v.begin(), v.end(), x)); } template IStream &operator>>(IStream &is, std::vector &vec) { for (auto &v : vec) is >> v; return is; } template OStream &operator<<(OStream &os, const std::vector &vec); template OStream &operator<<(OStream &os, const std::array &arr); template OStream &operator<<(OStream &os, const std::unordered_set &vec); template OStream &operator<<(OStream &os, const pair &pa); template OStream &operator<<(OStream &os, const std::deque &vec); template OStream &operator<<(OStream &os, const std::set &vec); template OStream &operator<<(OStream &os, const std::multiset &vec); template OStream &operator<<(OStream &os, const std::unordered_multiset &vec); template OStream &operator<<(OStream &os, const std::pair &pa); template OStream &operator<<(OStream &os, const std::map &mp); template OStream &operator<<(OStream &os, const std::unordered_map &mp); template OStream &operator<<(OStream &os, const std::tuple &tpl); template OStream &operator<<(OStream &os, const std::vector &vec) { os << '['; for (auto v : vec) os << v << ','; os << ']'; return os; } template OStream &operator<<(OStream &os, const std::array &arr) { os << '['; for (auto v : arr) os << v << ','; os << ']'; return os; } template std::istream &operator>>(std::istream &is, std::tuple &tpl) { std::apply([&is](auto &&... args) { ((is >> args), ...);}, tpl); return is; } template OStream &operator<<(OStream &os, const std::tuple &tpl) { os << '('; std::apply([&os](auto &&... args) { ((os << args << ','), ...);}, tpl); return os << ')'; } template OStream &operator<<(OStream &os, const std::unordered_set &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; } template OStream &operator<<(OStream &os, const std::deque &vec) { os << "deq["; for (auto v : vec) os << v << ','; os << ']'; return os; } template OStream &operator<<(OStream &os, const std::set &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; } template OStream &operator<<(OStream &os, const std::multiset &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; } template OStream &operator<<(OStream &os, const std::unordered_multiset &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; } template OStream &operator<<(OStream &os, const std::pair &pa) { return os << '(' << pa.first << ',' << pa.second << ')'; } template OStream &operator<<(OStream &os, const std::map &mp) { os << '{'; for (auto v : mp) os << v.first << "=>" << v.second << ','; os << '}'; return os; } template OStream &operator<<(OStream &os, const std::unordered_map &mp) { os << '{'; for (auto v : mp) os << v.first << "=>" << v.second << ','; os << '}'; return os; } #ifdef HITONANODE_LOCAL const string COLOR_RESET = "\033[0m", BRIGHT_GREEN = "\033[1;32m", BRIGHT_RED = "\033[1;31m", BRIGHT_CYAN = "\033[1;36m", NORMAL_CROSSED = "\033[0;9;37m", RED_BACKGROUND = "\033[1;41m", NORMAL_FAINT = "\033[0;2m"; #define dbg(x) std::cerr << BRIGHT_CYAN << #x << COLOR_RESET << " = " << (x) << NORMAL_FAINT << " (L" << __LINE__ << ") " << __FILE__ << COLOR_RESET << std::endl #define dbgif(cond, x) ((cond) ? std::cerr << BRIGHT_CYAN << #x << COLOR_RESET << " = " << (x) << NORMAL_FAINT << " (L" << __LINE__ << ") " << __FILE__ << COLOR_RESET << std::endl : std::cerr) #else #define dbg(x) ((void)0) #define dbgif(cond, x) ((void)0) #endif int main() { lint H, W, N; cin >> H >> W >> N; vector xys; map> y2xs; REP(i, N) { lint x, y; cin >> x >> y; xys.emplace_back(x, y); y2xs[y].push_back(x); } vector y2minxs; for (auto &[y, xs] : y2xs) { sort(xs.begin(), xs.end()); y2minxs.emplace_back(y, xs.front() - 1); } auto y2minxs_left = y2minxs, y2minxs_right = y2minxs; FOR(i, 1, y2minxs_left.size()) { chmin(y2minxs_left.at(i).second, y2minxs_left.at(i - 1).second + y2minxs_left.at(i).first - y2minxs_left.at(i - 1).first); } dbg(y2minxs_left); IREP(i, y2minxs_right.size() - 1) { chmin(y2minxs_right.at(i).second, y2minxs_right.at(i + 1).second + y2minxs_right.at(i + 1).first - y2minxs_right.at(i).first); } dbg(y2minxs_right); for (const auto [x, y] : xys) { const auto it = y2xs.lower_bound(y); const auto &[y2, near_xs] = *it; lint ret = 1LL << 60; { const int idx = arglb(near_xs, x); assert(near_xs.at(idx) == x); if (idx) { chmin(ret, (lint)x - near_xs.at(idx - 1)); } if (idx + 1 < (int)near_xs.size()) { chmin(ret, (lint)near_xs.at(idx + 1) - x); } } for (lint y2 : {y - 1, y + 1}) { auto itr = y2xs.lower_bound(y2); if (itr == y2xs.end()) continue; if (itr->first != y2) continue; const auto &near_xs = itr->second; const int idx = arglb(near_xs, x); if (idx) { lint x2 = near_xs.at(idx - 1); chmin(ret, abs(x - x2) + min(x, x2)); } if (idx + 1 < (int)near_xs.size()) { lint x2 = near_xs.at(idx + 1); chmin(ret, abs(x - x2) + min(x, x2)); } } assert(y2 == y); { int idx = arglb(y2minxs, plint(y, 0)); assert(y2minxs.at(idx).first == y); if (idx + 1 < (int)y2minxs_right.size()) { chmin(ret, x - 1 + y2minxs_right.at(idx + 1).second + abs(y2minxs_right.at(idx + 1).first - y)); } if (idx) { chmin(ret, x - 1 + y2minxs_left.at(idx - 1).second + abs(y2minxs_left.at(idx - 1).first - y)); } } cout << ret << '\n'; } }