Submission #74412

#	Time	Username	Problem	Language	Result	Execution time	Memory
74412		cheetose	Aquatic Labyrinth (FXCUP3_aqua)	C++11	36 / 100	1394 ms	191072 KiB

aqua

#include<cstdio>
#include<cstdlib>
#include<iostream>
#include<vector>
#include<queue>
#include<bitset>
#include<string>
#include<stack>
#include<set>
#include<unordered_set>
#include<map>
#include<unordered_map>
#include<cstring>
#include<complex>
#include<cmath>
#include<iomanip>
#include<numeric>
#include<algorithm>
#include<list>
#include<functional>
#include<cassert>
#define mp make_pair
#define pb push_back
#define X first
#define Y second
#define INF 987654321987654321
#define PI 3.14159265358979323846264
#define fup(i,a,b,c) for(int (i)=(a);(i)<=(b);(i)+=(c))
#define fdn(i,a,b,c) for(int (i)=(a);(i)>=(b);(i)-=(c))
#define MEM0(a) memset(a,0,sizeof(a));
#define MEM_1(a) memset(a,-1,sizeof(a));
#define ALL(a) a.begin(),a.end()
#define SYNC ios_base::sync_with_stdio(false);cin.tie(0)
using namespace std;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int, int> Pi;
typedef pair<ll, ll> Pll;
typedef pair<double, double> Pd;
typedef vector<int> Vi;
typedef vector<ll> Vll;
typedef vector<double> Vd;
typedef vector<Pi> VPi;
typedef vector<Pll> VPll;
typedef vector<Pd> VPd;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef tuple<ll, ll, ll> LLL;
typedef vector<iii> Viii;
typedef vector<LLL> VLLL;
typedef complex<double> base;
const int MOD = 1000000009;
ll POW(ll a, ll b, ll MMM = MOD) { ll ret = 1; for (; b; b >>= 1, a = (a*a) % MMM)if (b & 1)ret = (ret*a) % MMM; return ret; }
ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }
ll lcm(ll a, ll b) { if (a == 0 || b == 0)return a + b; return a*(b / gcd(a, b)); }
int dx[] = { 0,1,0,-1 }, dy[] = { 1,0,-1,0 };
int ddx[] = { 0,0,1,1,1,-1,-1,-1 }, ddy[] = { 1,-1,1,0,-1,1,0,-1 };
 
char s[900][901];
VPi v[3240002];
ll dist[3240002];
bool chk[3240002];
int parent[3240002];
int n;
inline int Z(int x,int y,int dir){return dir*n*n+x*n+y;}
const int SS=3240000,EE=3240001;
int main() {
	fill(dist,dist+3240002,INF);
	scanf("%d",&n);
	fup(i,0,n-1,1)scanf("%s",s[i]);
	Pi S,E;
	fup(i,0,n-1,1)
		fup(j,0,n-1,1)
	{
		if(s[i][j]=='M')S=mp(i,j);
		if(s[i][j]=='H')E=mp(i,j);
		if(s[i][j]=='.')
		{
			if(i!=0&&s[i-1][j]!='W')v[Z(i,j,3)].pb(mp(Z(i-1,j,3),0));
			if(i!=n-1&&s[i+1][j]!='W')v[Z(i,j,2)].pb(mp(Z(i+1,j,2),0));
			if(j!=0&&s[i][j-1]!='W')v[Z(i,j,1)].pb(mp(Z(i,j-1,1),0));
			if(j!=n-1&&s[i][j+1]!='W')v[Z(i,j,0)].pb(mp(Z(i,j+1,0),0));
		}
	}
	fup(i,0,n-1,1)
	{
		int t=0, to=-1;
		fdn(j,n-1,0,1)
		{
			if(s[i][j]=='W')t++;
			else
			{
				if(to!=-1)
					fup(kk,0,3,1)v[Z(i,j,kk)].pb(mp(to,t*t));
				if(j!=0&&s[i][j-1]=='W')
				{
					to=Z(i,j,0);
					t=0;
				}
			}
		}
		t=0, to=-1;
		fup(j,0,n-1,1)
		{
			if(s[i][j]=='W')t++;
			else
			{
				if(to!=-1)fup(kk,0,3,1)v[Z(i,j,kk)].pb(mp(to,t*t));
				if(j!=n-1 && s[i][j+1]=='W')
				{
					to=Z(i,j,1);
					t=0;
				}
			}
		}
	}
	fup(j,0,n-1,1)
	{
		int t=0, to=-1;
		fdn(i,n-1,0,1)
		{
			if(s[i][j]=='W')t++;
			else
			{
				if(to!=-1)fup(kk,0,3,1)v[Z(i,j,kk)].pb(mp(to,t*t));
				if(i!=0&&s[i-1][j]=='W')
				{
					to=Z(i,j,2);
					t=0;
				}
			}
		}
		t=0, to=-1;
		fup(i,0,n-1,1)
		{
			if(s[i][j]=='W')t++;
			else
			{
				if(to!=-1)fup(kk,0,3,1)v[Z(i,j,kk)].pb(mp(to,t*t));
				if(i!=n-1&&s[i+1][j]=='W')
				{
					to=Z(i,j,3);
					t=0;
				}
			}
		}
	}
	priority_queue<Pll> q;
	fup(i,0,3,1)
	{
		v[SS].pb(mp(Z(S.X,S.Y,i),0));
		v[Z(E.X,E.Y,i)].pb(mp(EE,0));
	}
	dist[SS] = 0;
	q.push({ 0,SS });
	while (!q.empty())
	{
		ll x = q.top().Y;
		q.pop();
		if (chk[x])continue;
		chk[x] = 1;
		for (const auto& p : v[x])
		{
			ll next = p.X, cost = p.Y;
			if (dist[next] > dist[x]+cost)
			{
				dist[next] = dist[x] + cost;
				parent[next]=x;
				q.push({ -dist[next],next });
			}
		}
	}
	printf("%lld\n",dist[EE]==INF?-1:dist[EE]);
}

Compilation message (stderr)

aqua.cpp: In function 'int main()':
aqua.cpp:70:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
aqua.cpp:71:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  fup(i,0,n-1,1)scanf("%s",s[i]);
                ~~~~~^~~~~~~~~~~

• Subtask 1: 36 / 36
• Subtask 2: 0 / 64