Submission #329358

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
329358	2020-11-20T19:21:14 Z	rqi	Mecho (IOI09_mecho)	C++14	66 / 100	1000 ms	7916 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, S;
bool bearclose[mx][mx]; //closed to the bear
bool beeclose[mx][mx];
vpi hives;
pi pstart, pend;
int bdist[mx][mx];

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

	queue<pair<int, pi>> q;

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

	while(sz(q)){
		int 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])));
		}
	}

}

int ctim[mx][mx];

bool works(int wait){

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

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

	while(sz(q)){
		int 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(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;
	
	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";
	// }

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

	while(lo < hi){
		int 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

#	Verdict	Execution time	Memory	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	1091 ms	364 KB	Time limit exceeded
6	Correct	1 ms	512 KB	Output is correct
7	Correct	102 ms	7628 KB	Output is correct
8	Execution timed out	1085 ms	492 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	876 KB	Output is correct
13	Execution timed out	1089 ms	748 KB	Time limit exceeded
14	Execution timed out	1094 ms	876 KB	Time limit exceeded
15	Correct	1 ms	492 KB	Output is correct
16	Correct	1 ms	492 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	620 KB	Output is correct
22	Correct	1 ms	620 KB	Output is correct
23	Correct	1 ms	748 KB	Output is correct
24	Correct	1 ms	748 KB	Output is correct
25	Correct	1 ms	876 KB	Output is correct
26	Correct	1 ms	876 KB	Output is correct
27	Correct	1 ms	876 KB	Output is correct
28	Correct	1 ms	876 KB	Output is correct
29	Correct	1 ms	876 KB	Output is correct
30	Correct	1 ms	876 KB	Output is correct
31	Correct	1 ms	1004 KB	Output is correct
32	Correct	1 ms	1004 KB	Output is correct
33	Correct	5 ms	3308 KB	Output is correct
34	Correct	5 ms	3328 KB	Output is correct
35	Correct	26 ms	3308 KB	Output is correct
36	Correct	6 ms	3692 KB	Output is correct
37	Correct	6 ms	3692 KB	Output is correct
38	Correct	34 ms	3692 KB	Output is correct
39	Correct	7 ms	4076 KB	Output is correct
40	Correct	8 ms	4076 KB	Output is correct
41	Correct	43 ms	4332 KB	Output is correct
42	Correct	9 ms	4588 KB	Output is correct
43	Correct	9 ms	4588 KB	Output is correct
44	Correct	53 ms	4588 KB	Output is correct
45	Correct	10 ms	4972 KB	Output is correct
46	Correct	10 ms	4972 KB	Output is correct
47	Correct	65 ms	4972 KB	Output is correct
48	Correct	12 ms	5484 KB	Output is correct
49	Correct	12 ms	5484 KB	Output is correct
50	Correct	78 ms	5484 KB	Output is correct
51	Correct	13 ms	5996 KB	Output is correct
52	Correct	13 ms	5996 KB	Output is correct
53	Correct	97 ms	5996 KB	Output is correct
54	Correct	15 ms	6380 KB	Output is correct
55	Correct	15 ms	6380 KB	Output is correct
56	Correct	115 ms	6380 KB	Output is correct
57	Correct	17 ms	6912 KB	Output is correct
58	Correct	17 ms	6892 KB	Output is correct
59	Correct	131 ms	6912 KB	Output is correct
60	Correct	19 ms	7276 KB	Output is correct
61	Correct	19 ms	7276 KB	Output is correct
62	Correct	156 ms	7276 KB	Output is correct
63	Execution timed out	1082 ms	7276 KB	Time limit exceeded
64	Correct	200 ms	7276 KB	Output is correct
65	Correct	174 ms	7404 KB	Output is correct
66	Correct	127 ms	7276 KB	Output is correct
67	Execution timed out	1082 ms	7276 KB	Time limit exceeded
68	Execution timed out	1087 ms	7404 KB	Time limit exceeded
69	Correct	50 ms	7404 KB	Output is correct
70	Correct	44 ms	7404 KB	Output is correct
71	Correct	41 ms	7404 KB	Output is correct
72	Correct	36 ms	7404 KB	Output is correct
73	Correct	38 ms	7788 KB	Output is correct
74	Correct	67 ms	7916 KB	Output is correct
75	Correct	75 ms	7832 KB	Output is correct
76	Correct	66 ms	7736 KB	Output is correct
77	Correct	70 ms	7788 KB	Output is correct
78	Execution timed out	1095 ms	7660 KB	Time limit exceeded
79	Correct	58 ms	7660 KB	Output is correct
80	Correct	74 ms	7660 KB	Output is correct
81	Correct	86 ms	7660 KB	Output is correct
82	Correct	69 ms	7660 KB	Output is correct
83	Execution timed out	1090 ms	7660 KB	Time limit exceeded
84	Correct	76 ms	7660 KB	Output is correct
85	Correct	77 ms	7660 KB	Output is correct
86	Correct	82 ms	7660 KB	Output is correct
87	Correct	82 ms	7660 KB	Output is correct
88	Execution timed out	1090 ms	7640 KB	Time limit exceeded
89	Correct	98 ms	7660 KB	Output is correct
90	Correct	93 ms	7640 KB	Output is correct
91	Correct	97 ms	7532 KB	Output is correct
92	Correct	90 ms	7660 KB	Output is correct