Submission #888191

#TimeUsernameProblemLanguageResultExecution timeMemory
888191RedGrey1993Tracks in the Snow (BOI13_tracks)C++17
100 / 100
465 ms124376 KiB
#include <bits/stdc++.h> using namespace std; template <typename T1, typename T2> istream &operator>>(istream &is, pair<T1, T2> &pa) { is >> pa.first >> pa.second; return is; } template <typename T> istream &operator>>(istream &is, vector<T> &vec) { for (auto &v : vec) is >> v; return is; } template <typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &pa) { os << "(" << pa.first << "," << pa.second << ")"; return os; } template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec) { os << "["; for (auto v : vec) os << v << ","; os << "]"; return os; } template <typename T> ostream &operator<<(ostream &os, const deque<T> &vec) { os << "deq["; for (auto v : vec) os << v << ","; os << "]"; return os; } template <typename T> ostream &operator<<(ostream &os, const set<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; } template <typename T> ostream &operator<<(ostream &os, const multiset<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; } template <typename T> ostream &operator<<(ostream &os, const unordered_set<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; } template <typename T> ostream &operator<<(ostream &os, const unordered_multiset<T> &vec) { os << "{"; for (auto v : vec) os << v << ","; os << "}"; return os; } template <typename TK, typename TV> ostream &operator<<(ostream &os, const unordered_map<TK, TV> &mp) { os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; } template <typename TK, typename TV> ostream &operator<<(ostream &os, const map<TK, TV> &mp) { os << "{"; for (auto v : mp) os << v.first << "=>" << v.second << ","; os << "}"; return os; } template <typename T> void resize_array(vector<T> &vec, int len) { vec.resize(len); } template <typename T, typename... Args> void resize_array(vector<T> &vec, int len, Args... args) { vec.resize(len); for (auto &v : vec) resize_array(v, args...); } template <typename T1, typename T2> pair<T1, T2> operator+(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first + r.first, l.second + r.second); } template <typename T1, typename T2> pair<T1, T2> operator-(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first - r.first, l.second - r.second); } long long gcd(long long a, long long b) { return b ? gcd(b, a % b) : a; } mt19937 mrand(random_device{}()); int rnd(int x) { return mrand() % x; } template <unsigned int MOD> class ModInt { public: // static unsigned int MOD; ModInt(unsigned long long _v = 0) { set_v((_v % MOD + MOD)); } explicit operator bool() const { return val != 0; } ModInt operator-() const { return ModInt() - *this; } ModInt operator+(const ModInt &r) const { return ModInt().set_v(val + r.val); } ModInt operator-(const ModInt &r) const { return ModInt().set_v(val + MOD - r.val); } ModInt operator*(const ModInt &r) const { return ModInt().set_v((unsigned int)((unsigned long long)(val)*r.val % MOD)); } ModInt operator/(const ModInt &r) const { return *this * r.inv(); } ModInt &operator+=(const ModInt &r) { return *this = *this + r; } ModInt &operator-=(const ModInt &r) { return *this = *this - r; } ModInt &operator*=(const ModInt &r) { return *this = *this * r; } ModInt &operator/=(const ModInt &r) { return *this = *this / r; } // ModInt &operator=(unsigned long long _v) { set_v((_v % MOD + MOD)); return *this; } unsigned int operator=(unsigned long long _v) { set_v((_v % MOD + MOD)); return val; } bool operator==(const ModInt &r) const { return val == r.val; } bool operator!=(const ModInt &r) const { return val != r.val; } ModInt pow(long long n) const { ModInt x = *this, r = 1; while (n) { if (n & 1) r *= x; x *= x; n >>= 1; } return r; } ModInt inv() const { return pow(MOD - 2); } unsigned int get_val() { return val; } friend ostream &operator<<(ostream &os, const ModInt &r) { return os << r.val; } friend istream &operator>>(istream &is, ModInt &r) { return is >> r.val; } private: unsigned int val; ModInt &set_v(unsigned int _v) { val = (_v < MOD) ? _v : _v - MOD; return *this; } }; // constexpr unsigned int mod = 1e9+7; constexpr unsigned int mod = 998244353; using Mint = ModInt<mod>; #define rep(i, a, n) for (int i = a; i < (n); i++) #define per(i, a, n) for (int i = (n)-1; i >= a; i--) #define pb push_back #define mp make_pair #define all(x) (x).begin(), (x).end() #define fi first #define se second #define sz(x) ((int)(x).size()) typedef vector<int> vi; typedef long long ll; typedef unsigned int uint; typedef unsigned long long ull; typedef pair<int, int> pii; typedef double db; #if DEBUG #define dbg(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ") " << __FILE__ << endl; #else #define dbg(x) #endif using Mint2 = ModInt<mod-1>; // unsigned int ModInt::MOD = 0; class Solution { public: void Solve() { int dir[4][2] = {{-1,0},{1,0},{0,-1},{0,1}}; int h,w; while (cin>>h>>w) { vector<string> grid(h); rep(i,0,h) cin>>grid[i]; vector<vi> dis(h, vi(w, numeric_limits<int>::max())); deque<pii> q; q.emplace_back(mp(0,0)); dis[0][0] = 0; int ans = 0; while(!q.empty()) { auto u = q.front(); q.pop_front(); ans = dis[u.first][u.second] + 1; rep(i,0,4) { pii v = mp(u.first+dir[i][0], u.second+dir[i][1]); if (v.first <0 || v.first >= h || v.second <0 || v.second >=w) continue; if (grid[v.first][v.second] == '.') continue; // dbg(v); int d = grid[u.first][u.second] != grid[v.first][v.second]; if (dis[v.first][v.second] > dis[u.first][u.second] + d) { dis[v.first][v.second] = dis[u.first][u.second] + d; if (d==1) q.emplace_back(v); else q.emplace_front(v); } } } cout << ans << endl; } } private: }; // #define USACO 1 void set_io(const string &name = "") { ios::sync_with_stdio(false); cin.tie(nullptr); #if FILE_IO || USACO if (!name.empty()) { freopen((name + ".in").c_str(), "r", stdin); freopen((name + ".out").c_str(), "w", stdout); } #endif } int main() { #if USACO set_io("odometer"); #else set_io("input"); #endif Solution().Solve(); return 0; }
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