Submission #9294250

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Source Code Expand

#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<ld,ld> pd; 
#define mp make_pair
#define f first
#define s second

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

#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) (x).rbegin(), (x).rend() 
#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; // = (119<<23)+1
const int MX = 2e5+5; 
const ll INF = 1e18; 
const ld PI = 4*atan((ld)1); 
const int xd[4] = {0,1,0,-1}, yd[4] = {1,0,-1,0}; 

template<class T> bool ckmin(T& a, const T& b) { 
	return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { 
	return a < b ? a = b, 1 : 0; }
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count());

#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;

template <class T> using Tree = tree<T, null_type, less<T>, 
	rb_tree_tag, tree_order_statistics_node_update>; 
// change null_type for map
#define ook order_of_key
#define fbo find_by_order

void treeExample() {
	Tree<int> t, t2; t.insert(8);
	auto it = t.insert(10).f; assert(it == t.lb(9));
	assert(t.ook(10) == 1); assert(t.ook(11) == 2);
	assert(*t.fbo(0) == 8);
	t.join(t2); // assuming T < T2 or T > T2, merge t2 into t
}

namespace input {
	template<class T> void re(complex<T>& x);
	template<class T1, class T2> void re(pair<T1,T2>& p);
	template<class T> void re(vector<T>& a);
	template<class T, size_t SZ> void re(array<T,SZ>& a);

	template<class T> void re(T& x) { cin >> x; }
	void re(double& x) { string t; re(t); x = stod(t); }
	void re(ld& x) { string t; re(t); x = stold(t); }
	template<class T, class... Ts> void re(T& t, Ts&... ts) { 
		re(t); re(ts...); 
	}

	template<class T> void re(complex<T>& x) { T a,b; re(a,b); x = cd(a,b); }
	template<class T1, class T2> void re(pair<T1,T2>& p) { re(p.f,p.s); }
	template<class T> void re(vector<T>& a) { F0R(i,sz(a)) re(a[i]); }
	template<class T, size_t SZ> void re(array<T,SZ>& a) { F0R(i,SZ) re(a[i]); }
}

using namespace input;

namespace output {
	void pr(int x) { cout << x; }
	void pr(long x) { cout << x; }
	void pr(ll x) { cout << x; }
	void pr(unsigned x) { cout << x; }
	void pr(unsigned long x) { cout << x; }
	void pr(unsigned long long x) { cout << x; }
	void pr(float x) { cout << x; }
	void pr(double x) { cout << x; }
	void pr(ld x) { cout << x; }
	void pr(char x) { cout << x; }
	void pr(const char* x) { cout << x; }
	void pr(const string& x) { cout << x; }
	void pr(bool x) { pr(x ? "true" : "false"); }
	template<class T> void pr(const complex<T>& x) { cout << x; }
	
	template<class T1, class T2> void pr(const pair<T1,T2>& x);
	template<class T> void pr(const T& x);
	
	template<class T, class... Ts> void pr(const T& t, const Ts&... ts) { 
		pr(t); pr(ts...); 
	}
	template<class T1, class T2> void pr(const pair<T1,T2>& x) { 
		pr("{",x.f,", ",x.s,"}"); 
	}
	template<class T> void pr(const T& x) { 
		pr("{"); // const iterator needed for vector<bool>
		bool fst = 1; for (const auto& a: x) pr(!fst?", ":"",a), fst = 0; 
		pr("}");
	}
	
	void ps() { pr("\n"); } // print w/ spaces
	template<class T, class... Ts> void ps(const T& t, const Ts&... ts) { 
		pr(t); if (sizeof...(ts)) pr(" "); ps(ts...); 
	}
	
	void pc() { pr("]\n"); } // debug w/ commas
	template<class T, class... Ts> void pc(const T& t, const Ts&... ts) { 
		pr(t); if (sizeof...(ts)) pr(", "); pc(ts...); 
	}
	#define dbg(x...) pr("[",#x,"] = ["), pc(x);
}

using namespace output;

namespace io {
	void setIn(string s) { freopen(s.c_str(),"r",stdin); }
	void setOut(string s) { freopen(s.c_str(),"w",stdout); }
	void setIO(string s = "") {
		ios_base::sync_with_stdio(0); cin.tie(0); // fast I/O
		// cin.exceptions(cin.failbit); // ex. throws exception when you try to read letter into int
		if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
	}
}

using namespace io;

struct mi {
	typedef decay<decltype(MOD)>::type T;
	T val; 
	explicit operator T() const { return val; }
	mi() { val = 0; }
	mi(ll v) { 
		val = (-MOD <= v && v <= MOD) ? v : v % MOD;
		if (val < 0) val += MOD;
	}
	friend bool operator==(const mi& a, const mi& b) { 
		return a.val == b.val; }
	friend bool operator!=(const mi& a, const mi& b) { 
		return !(a == b); }
	friend bool operator<(const mi& a, const mi& b) { 
		return a.val < b.val; }
	friend void re(mi& a) { ll x; re(x); a = mi(x); }
	friend void pr(const mi& a) { pr(a.val); }
	friend ostream& operator<<(ostream& os, const mi& a) { 
		return os << a.val; }
   
	mi operator-() const { return mi(-val); }
	mi& operator+=(const mi& m) { 
		if ((val += m.val) >= MOD) val -= MOD; 
		return *this; }
	mi& operator-=(const mi& m) { 
		if ((val -= m.val) < 0) val += MOD; 
		return *this; }
	mi& operator++() { return *this += 1; }
	mi& operator--() { return *this -= 1; }
	friend mi operator+(mi a, const mi& b) { return a += b; }
	friend mi operator-(mi a, const mi& b) { return a -= b; }

	mi& operator*=(const mi& m) { 
		val = (ll)val*m.val%MOD; return *this; }
	friend mi pow(mi a, ll p) {
		mi ans = 1; assert(p >= 0);
		for (; p; p /= 2, a *= a) if (p&1) ans *= a;
		return ans;
	}
	friend mi inv(const mi& a) { 
		assert(!(a == 0)); return pow(a,MOD-2); }
	mi& operator/=(const mi& m) { return (*this) *= inv(m); }
	friend mi operator*(mi a, const mi& b) { return a *= b; }
	friend mi operator/(mi a, const mi& b) { return a /= b; }
};
typedef pair<mi,mi> pmi;
typedef vector<mi> vmi;
typedef vector<pmi> vpmi;

int N,ins[4][300], ver[300], hor[300], dir[300][300];
pi nex[300][300][4];
str lets = "UDLR";

vpi st;
bool vis[300][300];

const pi ID = mp(MOD,MOD);

void prin() {
	// ps("ER",nex[])
	/*F0R(i,N) {
		F0R(j,N) {
			if (dir[i][j] == MOD) pr('*');
			else pr(dir[i][j]);
		}
		ps();
	}
	ps("------");*/
}

void rem(int a, int b) {
	int& d = dir[a][b];
	assert(d != MOD);
	if (nex[a][b][d] != ID) {
		ps("REM",a,b,d,nex[a][b][d]);
		exit(5);
	}
	if (d == 0) {
		pr("U",b+1,'\n');
	} else if (d == 1) {
		pr("D",b+1,'\n');
	} else if (d == 2) {
		pr("L",a+1,'\n');
	} else {
		pr("R",a+1,'\n');
	}
	for (int i = 0; i <= 2; i += 2) {
		pi x = nex[a][b][i], y = nex[a][b][i^1];
		if (x != ID) nex[x.f][x.s][i^1] = y;
		if (y != ID) nex[y.f][y.s][i] = x;
	}
	d = MOD;
	prin();
}

void solve(pi p) {
	// if (p == ID || dir[p.f][p.s] == MOD) return;
	if (vis[p.f][p.s]) {
		prin();
		int ind = sz(st)-1;
		while (st[ind] != p) ind --;
		vi v;
		FOR(i,ind,sz(st)) v.pb(dir[st[i].f][st[i].s]);
		rotate(begin(v),end(v)-1,end(v));
		FOR(i,ind,sz(st)) dir[st[i].f][st[i].s] = v[i-ind];
		while (sz(st) > ind+1) {
			vis[st.back().f][st.back().s] = 0;
			st.pop_back();
		}
		prin();
		return;
	}
	vis[p.f][p.s] = 1; st.pb(p);
	while (1) {
		if (!vis[p.f][p.s]) return;
		if (nex[p.f][p.s][dir[p.f][p.s]] == ID) break;
		solve(nex[p.f][p.s][dir[p.f][p.s]]);
	}
	vis[p.f][p.s] = 0; st.pop_back();
	rem(p.f,p.s);
}

int main() {
	// ios_base::sync_with_stdio(0); cin.tie(0);
	re(N);
	F0R(i,4) F0R(j,N) {
		re(ins[i][j]);
		if (i <= 1) ver[j] += ins[i][j];
		else hor[j] += ins[i][j];
	}
	F0R(i,N) if (ver[i] > N || hor[i] > N) {
		ps("NO");
		exit(0);
	}
	F0R(i,N) {
		vpi v;
		F0R(j,N) v.pb({ver[j],j});
		sort(rall(v));
		// ps("??",v,N-hor[i]);
		F0R(j,N) dir[i][j] = 2;
		F0R(j,N-hor[i]) {
			dir[i][v[j].s] = 0;
			if (ver[v[j].s] == 0) {
				ps("NO");
				exit(0);
			}
			ver[v[j].s] --;
		}
	}
	F0R(i,N) {
		F0R(j,N) if (dir[i][j] == 2) {
			if (ins[3][i]) dir[i][j] = 3, ins[3][i] --;
		}
	}
	F0R(j,N) {
		F0R(i,N) if (dir[i][j] == 0) {
			if (ins[1][j]) dir[i][j] = 1, ins[1][j] --;
		}
	}
	F0R(j,N) {
		pi lst = {MOD,MOD};
		F0R(i,N) {
			nex[i][j][0] = lst;
			lst = {i,j};
		}
		lst = {MOD,MOD};
		R0F(i,N) {
			nex[i][j][1] = lst;
			lst = {i,j};
		}
	}
	F0R(i,N) {
		pi lst = {MOD,MOD};
		F0R(j,N) {
			nex[i][j][2] = lst;
			lst = {i,j};
		}
		lst = {MOD,MOD};
		R0F(j,N) {
			nex[i][j][3] = lst;
			lst = {i,j};
		}
	}
	F0R(i,N) F0R(j,N) if (dir[i][j] != MOD) solve({i,j});
	/*F0R(i,N) {
		F0R(j,N) pr(dir[i][j]);
		ps();
	}*/
	// you should actually read the stuff at the bottom
}

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

Submission Info

Compile Error

./Main.cpp: In function ‘void io::setIn(std::string)’:
./Main.cpp:140:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
  void setIn(string s) { freopen(s.c_str(),"r",stdin); }
                                                     ^
./Main.cpp: In function ‘void io::setOut(std::string)’:
./Main.cpp:141:55: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
  void setOut(string s) { freopen(s.c_str(),"w",stdout); }
                                                       ^

Judge Result