제출 #329365

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
329365		rqi	Mecho (IOI09_mecho)	C++14	27 / 100	7 ms	1900 KiB

mecho

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef long double ld;
typedef double db; 
typedef string str; 

typedef pair<int,int> pi;
typedef pair<ll,ll> pl; 
typedef pair<db,db> pd; 

typedef vector<int> vi; 
typedef vector<bool> vb; 
typedef vector<ll> vl; 
typedef vector<db> vd; 
typedef vector<str> vs; 
typedef vector<pi> vpi;
typedef vector<pl> vpl; 
typedef vector<pd> vpd; 

#define mp make_pair
#define f first
#define s second
#define sz(x) (int)(x).size()
#define all(x) begin(x), end(x)
#define rall(x) (x).rbegin(), (x).rend() 
#define sor(x) sort(all(x)) 
#define rsz resize
#define ins insert 
#define ft front() 
#define bk back()
#define pf push_front 
#define pb push_back
#define eb emplace_back 
#define lb lower_bound 
#define ub upper_bound 

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

const int MOD = 1e9+7; // 998244353;
const int MX = 2e5+5; 
const ll INF = 1e18; 
const ld PI = acos((ld)-1);
const int xd[4] = {1,0,-1,0}, yd[4] = {0,1,0,-1}; 
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); 

template<class T> bool ckmin(T& a, const T& b) { 
	return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { 
	return a < b ? a = b, 1 : 0; } 
constexpr int pct(int x) { return __builtin_popcount(x); } 
constexpr int bits(int x) { return 31-__builtin_clz(x); } // floor(log2(x)) 
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
ll half(ll x) { return fdiv(x,2); }

template<class T, class U> T fstTrue(T lo, T hi, U f) { 
	// note: if (lo+hi)/2 is used instead of half(lo+hi) then this will loop infinitely when lo=hi
	hi ++; assert(lo <= hi); // assuming f is increasing
	while (lo < hi) { // find first index such that f is true 
		T mid = half(lo+hi);
		f(mid) ? hi = mid : lo = mid+1; 
	} 
	return lo;
}
template<class T, class U> T lstTrue(T lo, T hi, U f) {
	lo --; assert(lo <= hi); // assuming f is decreasing
	while (lo < hi) { // find first index such that f is true 
		T mid = half(lo+hi+1);
		f(mid) ? lo = mid : hi = mid-1;
	} 
	return lo;
}
template<class T> void remDup(vector<T>& v) { 
	sort(all(v)); v.erase(unique(all(v)),end(v)); }

// INPUT
template<class A> void re(complex<A>& c);
template<class A, class B> void re(pair<A,B>& p);
template<class A> void re(vector<A>& v);
template<class A, size_t SZ> void re(array<A,SZ>& a);

template<class T> void re(T& x) { cin >> x; }
void re(db& d) { str t; re(t); d = stod(t); }
void re(ld& d) { str t; re(t); d = stold(t); }
template<class H, class... T> void re(H& h, T&... t) { re(h); re(t...); }

template<class A> void re(complex<A>& c) { A a,b; re(a,b); c = {a,b}; }
template<class A, class B> void re(pair<A,B>& p) { re(p.f,p.s); }
template<class A> void re(vector<A>& x) { trav(a,x) re(a); }
template<class A, size_t SZ> void re(array<A,SZ>& x) { trav(a,x) re(a); }

// TO_STRING
#define ts to_string
str ts(char c) { return str(1,c); }
str ts(const char* s) { return (str)s; }
str ts(str s) { return s; }
str ts(bool b) { 
	#ifdef LOCAL
		return b ? "true" : "false"; 
	#else 
		return ts((int)b);
	#endif
}
template<class A> str ts(complex<A> c) { 
	stringstream ss; ss << c; return ss.str(); }
str ts(vector<bool> v) {
	str res = "{"; F0R(i,sz(v)) res += char('0'+v[i]);
	res += "}"; return res; }
template<size_t SZ> str ts(bitset<SZ> b) {
	str res = ""; F0R(i,SZ) res += char('0'+b[i]);
	return res; }
template<class A, class B> str ts(pair<A,B> p);
template<class T> str ts(T v) { // containers with begin(), end()
	#ifdef LOCAL
		bool fst = 1; str res = "{";
		for (const auto& x: v) {
			if (!fst) res += ", ";
			fst = 0; res += ts(x);
		}
		res += "}"; return res;
	#else
		bool fst = 1; str res = "";
		for (const auto& x: v) {
			if (!fst) res += " ";
			fst = 0; res += ts(x);
		}
		return res;

	#endif
}
template<class A, class B> str ts(pair<A,B> p) {
	#ifdef LOCAL
		return "("+ts(p.f)+", "+ts(p.s)+")"; 
	#else
		return ts(p.f)+" "+ts(p.s);
	#endif
}

// OUTPUT
template<class A> void pr(A x) { cout << ts(x); }
template<class H, class... T> void pr(const H& h, const T&... t) { 
	pr(h); pr(t...); }
void ps() { pr("\n"); } // print w/ spaces
template<class H, class... T> void ps(const H& h, const T&... t) { 
	pr(h); if (sizeof...(t)) pr(" "); ps(t...); }

// DEBUG
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) {
	cerr << ts(h); if (sizeof...(t)) cerr << ", ";
	DBG(t...); }
#ifdef LOCAL // compile with -DLOCAL, chk -> fake assert
	#define dbg(...) cerr << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
	#define chk(...) if (!(__VA_ARGS__)) cerr << "Line(" << __LINE__ << ") -> function(" \
		 << __FUNCTION__  << ") -> CHK FAILED: (" << #__VA_ARGS__ << ")" << "\n", exit(0);
#else
	#define dbg(...) 0
	#define chk(...) 0
#endif

// FILE I/O
void setIn(str s) { freopen(s.c_str(),"r",stdin); }
void setOut(str s) { freopen(s.c_str(),"w",stdout); }
void unsyncIO() { cin.tie(0)->sync_with_stdio(0); }
void setIO(str s = "") {
	unsyncIO();
	// cin.exceptions(cin.failbit); 
	// throws exception when do smth illegal
	// ex. try to read letter into int
	if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
}

const int mx = 805;
int N;
ll S;
bool bearclose[mx][mx]; //closed to the bear
bool beeclose[mx][mx];
vpi hives;
pi pstart, pend;
ll bdist[mx][mx];

void genBeeDists(){
	for(int i = 1; i <= N; i++){
		for(int j = 1; j <= N; j++){
			bdist[i][j] = INF;
		}
	}

	queue<pair<ll, pi>> q;

	for(auto u: hives){
		bdist[u.f][u.s] = 0;
		q.push(mp(0, u));
	}

	int opo = 0;
	
	while(sz(q)){
		ll dist = q.front().f;
		pi pos = q.front().s;
		q.pop();
		for(int d = 0; d < 4; d++){
			if(beeclose[pos.f+xd[d]][pos.s+yd[d]]) continue;
			if(bdist[pos.f+xd[d]][pos.s+yd[d]] <= dist+1) continue;
			bdist[pos.f+xd[d]][pos.s+yd[d]] = dist+1;
			q.push(mp(dist+1, mp(pos.f+xd[d], pos.s+yd[d])));
		}

		opo++;
		if(opo >= 100000 || sz(q) >= 100000){
			assert(0==1);
		}
		
	}

}

ll ctim[mx][mx];

bool works(ll wait){

	for(int i = 1; i <= N; i++){
		for(int j = 1; j <= N; j++){
			ctim[i][j] = INF;
		}
	}

	queue<pair<ll, pi>> q;
	if(bdist[pstart.f][pstart.s] == INF || wait*S >= ll(S)*ll(bdist[pstart.f][pstart.s])) return 0;
	q.push(mp(wait*S, pstart));

	int opo = 0;
	while(sz(q)){
		ll dist = q.front().f;
		pi pos = q.front().s;
		q.pop();
		// if(wait == 2){
		// 	dbg(pos);
		// }
		if(pos == pend) return 1;

		for(int d = 0; d < 4; d++){
			if(bearclose[pos.f+xd[d]][pos.s+yd[d]]) continue;
			if(ctim[pos.f+xd[d]][pos.s+yd[d]] <= dist+1) continue;
			if(bdist[pos.f+xd[d]][pos.s+yd[d]] != INF && dist+1 >= ll(S)*ll(bdist[pos.f+xd[d]][pos.s+yd[d]])) continue;
			ctim[pos.f+xd[d]][pos.s+yd[d]] = dist+1;
			q.push(mp(dist+1, mp(pos.f+xd[d], pos.s+yd[d])));
		}
		opo++;
		if(opo >= 100000 || sz(q) >= 100000){
			assert(0==1);
		}
	}

	return 0;
}

int main() {
	setIO();
	cin >> N >> S;
	assert(N <= 60);
	
	for(int i = 1; i <= N; i++){
		string s;
		cin >> s;
		for(int j = 0; j < N; j++){
			if(s[j] == 'T'){
				bearclose[i][j+1] = 1;
				beeclose[i][j+1] = 1;
			}
			else if(s[j] == 'G'){

			}
			else if(s[j] == 'M'){
				pstart = mp(i, j+1);
			}
			else if(s[j] == 'D'){
				beeclose[i][j+1] = 1;
				pend = mp(i, j+1);
			}
			else if(s[j] == 'H'){
				bearclose[i][j+1] = 1;
				hives.pb(mp(i, j+1));
			}
		}
	}

	for(int i = 0; i <= N+1; i++){
		bearclose[i][0] = 1;
		bearclose[i][N+1] = 1;
		bearclose[0][i] = 1;
		bearclose[N+1][i] = 1;
		beeclose[i][0] = 1;
		beeclose[i][N+1] = 1;
		beeclose[0][i] = 1;
		beeclose[N+1][i] = 1;
	}

	genBeeDists();

	// for(int i = 1; i <= N; i++){
	// 	for(int j = 1; j <= N; j++){
	// 		cout << bdist[i][j] << " ";
	// 	}
	// 	cout << "\n";
	// }

	ll lo = -1;
	ll hi = mx*mx;

	int opo = 0;

	while(lo < hi){
		ll mid = (lo+hi)/2+1;
		if(works(mid)){
			lo = mid;
		}
		else hi = mid-1;

		opo++;
		if(opo >= 100){
			assert(0==1);
		}
	}

	ps(lo);

	// you should actually read the stuff at the bottom
}

/* stuff you should look for
	* int overflow, array bounds
	* special cases (n=1?)
	* do smth instead of nothing and stay organized
	* WRITE STUFF DOWN
*/

컴파일 시 표준 에러 (stderr) 메시지

mecho.cpp: In function 'void setIn(str)':
mecho.cpp:168:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  168 | void setIn(str s) { freopen(s.c_str(),"r",stdin); }
      |                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
mecho.cpp: In function 'void setOut(str)':
mecho.cpp:169:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  169 | void setOut(str s) { freopen(s.c_str(),"w",stdout); }
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 27 / 100