답안 #329362

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
329362	2020-11-20T19:35:17 Z	rqi	Mecho (IOI09_mecho)	C++14	66 / 100	1000 ms	12396 KB

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 >= 100000000){
			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));

	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])));
		}
	}

	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;

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

Compilation message

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

66.0 / 100.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	364 KB	Output is correct
2	Correct	1 ms	364 KB	Output is correct
3	Correct	1 ms	364 KB	Output is correct
4	Correct	1 ms	364 KB	Output is correct
5	Execution timed out	1083 ms	492 KB	Time limit exceeded
6	Correct	1 ms	492 KB	Output is correct
7	Correct	117 ms	12140 KB	Output is correct
8	Execution timed out	1090 ms	512 KB	Time limit exceeded
9	Correct	1 ms	492 KB	Output is correct
10	Correct	1 ms	492 KB	Output is correct
11	Correct	1 ms	492 KB	Output is correct
12	Correct	1 ms	1004 KB	Output is correct
13	Execution timed out	1093 ms	876 KB	Time limit exceeded
14	Execution timed out	1071 ms	1132 KB	Time limit exceeded
15	Correct	1 ms	620 KB	Output is correct
16	Correct	1 ms	620 KB	Output is correct
17	Correct	1 ms	620 KB	Output is correct
18	Correct	1 ms	620 KB	Output is correct
19	Correct	1 ms	620 KB	Output is correct
20	Correct	1 ms	620 KB	Output is correct
21	Correct	1 ms	748 KB	Output is correct
22	Correct	1 ms	748 KB	Output is correct
23	Correct	1 ms	876 KB	Output is correct
24	Correct	1 ms	876 KB	Output is correct
25	Correct	1 ms	1004 KB	Output is correct
26	Correct	1 ms	1004 KB	Output is correct
27	Correct	1 ms	1004 KB	Output is correct
28	Correct	1 ms	1004 KB	Output is correct
29	Correct	1 ms	1132 KB	Output is correct
30	Correct	1 ms	1132 KB	Output is correct
31	Correct	1 ms	1132 KB	Output is correct
32	Correct	1 ms	1132 KB	Output is correct
33	Correct	6 ms	5356 KB	Output is correct
34	Correct	6 ms	5356 KB	Output is correct
35	Correct	29 ms	5376 KB	Output is correct
36	Correct	7 ms	5996 KB	Output is correct
37	Correct	8 ms	6016 KB	Output is correct
38	Correct	38 ms	5996 KB	Output is correct
39	Correct	9 ms	6764 KB	Output is correct
40	Correct	9 ms	6784 KB	Output is correct
41	Correct	49 ms	6764 KB	Output is correct
42	Correct	10 ms	7552 KB	Output is correct
43	Correct	10 ms	7532 KB	Output is correct
44	Correct	64 ms	7660 KB	Output is correct
45	Correct	12 ms	8172 KB	Output is correct
46	Correct	18 ms	8172 KB	Output is correct
47	Correct	81 ms	8172 KB	Output is correct
48	Correct	14 ms	8940 KB	Output is correct
49	Correct	14 ms	8940 KB	Output is correct
50	Correct	98 ms	8940 KB	Output is correct
51	Correct	18 ms	9580 KB	Output is correct
52	Correct	16 ms	9708 KB	Output is correct
53	Correct	129 ms	9580 KB	Output is correct
54	Correct	17 ms	10368 KB	Output is correct
55	Correct	18 ms	10348 KB	Output is correct
56	Correct	152 ms	10348 KB	Output is correct
57	Correct	20 ms	10988 KB	Output is correct
58	Correct	20 ms	10988 KB	Output is correct
59	Correct	171 ms	10988 KB	Output is correct
60	Correct	21 ms	11756 KB	Output is correct
61	Correct	22 ms	11756 KB	Output is correct
62	Correct	197 ms	11884 KB	Output is correct
63	Execution timed out	1089 ms	11756 KB	Time limit exceeded
64	Correct	212 ms	11928 KB	Output is correct
65	Correct	195 ms	11884 KB	Output is correct
66	Correct	141 ms	11756 KB	Output is correct
67	Execution timed out	1091 ms	11756 KB	Time limit exceeded
68	Execution timed out	1098 ms	11756 KB	Time limit exceeded
69	Correct	62 ms	11884 KB	Output is correct
70	Correct	53 ms	11884 KB	Output is correct
71	Correct	48 ms	11756 KB	Output is correct
72	Correct	41 ms	11756 KB	Output is correct
73	Correct	43 ms	12396 KB	Output is correct
74	Correct	78 ms	12268 KB	Output is correct
75	Correct	88 ms	12152 KB	Output is correct
76	Correct	77 ms	12268 KB	Output is correct
77	Correct	83 ms	12268 KB	Output is correct
78	Execution timed out	1096 ms	12268 KB	Time limit exceeded
79	Correct	66 ms	12268 KB	Output is correct
80	Correct	85 ms	12268 KB	Output is correct
81	Correct	98 ms	12268 KB	Output is correct
82	Correct	92 ms	12268 KB	Output is correct
83	Execution timed out	1093 ms	12140 KB	Time limit exceeded
84	Correct	90 ms	12252 KB	Output is correct
85	Correct	88 ms	12140 KB	Output is correct
86	Correct	96 ms	12016 KB	Output is correct
87	Correct	99 ms	12088 KB	Output is correct
88	Execution timed out	1085 ms	12012 KB	Time limit exceeded
89	Correct	103 ms	12012 KB	Output is correct
90	Correct	107 ms	12012 KB	Output is correct
91	Correct	118 ms	12012 KB	Output is correct
92	Correct	110 ms	12012 KB	Output is correct