제출 #646489

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
646489		inksamurai	Portal (COCI17_portal)	C++17	48 / 120	73 ms	2896 KiB

portal

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _3dSgv16 ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
using pii=pair<int,int>;
using vi=vector<int>;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}
// e

using T=pair<pii,int>;

signed main(){
_3dSgv16;
	int h,w;
	cin>>h>>w;

	const int n=h*w;
	vec(string) a(h);
	rep(i,h){
		cin>>a[i];
	}

	auto get_id=[&](int x,int y,int t)->int{
		return x*w+y+t*n;
	};

	auto get_pnt=[&](int id)->T{
		int t=0;
		if(id>=n){
			id-=n;
			t=1;
		}
		return {{id/w,id%w},t};
	};

	const int inf=1e9;
	priority_queue<pii,vec(pii),greater<pii>> pq;
	vi dp(2*n,inf);
	rep(i,h){
		rep(j,w){
			if(a[i][j]=='C'){
				int id=get_id(i,j,0);
				dp[id]=0;
				pq.push({0,id});
				break;
			}
		}
	}

	auto ok=[&](int x,int y)->bool{
		return min(x,y)>=0 and x<h and y<w;
	};

	auto push=[&](int id,int w){
		if(dp[id]>w){
			dp[id]=w;
			pq.push({w,id});
		}
	};

	const int di[]={1,-1,0,0};
	const int dj[]={0,0,1,-1};
	while(sz(pq)){
		auto top=pq.top();
		pq.pop();
		if(dp[top.se]!=top.fi) continue;
		auto v=get_pnt(top.se);
		int i=v.fi.fi,j=v.fi.se,t=v.se;
		int w=top.fi;
		// print(i,j,t,w);
		rep(dir,4){
			int ni=i,nj=j;
			rep(_,max(h,w)+1){
				ni+=di[dir],nj+=dj[dir];
				if(!ok(ni,nj) or a[ni][nj]=='#'){
					break;
				}
				if(!_){
					int nid=get_id(ni,nj,0);
					push(nid,w+1);
				}
				int nni=ni+di[dir],nnj=nj+dj[dir];
				if(ok(nni,nnj) and a[nni][nnj]=='#'){
					int nid=get_id(ni,nj,1);
					push(nid,w+1);
				}
			}
		}
	}

	// print(dp[get_id(1,5,1)]);
	int ans=inf;
	rep(i,h){
		rep(j,w){
			if(a[i][j]=='F'){
				ans=min(dp[get_id(i,j,0)],dp[get_id(i,j,1)]);
			}
		}
	}
	print(ans==inf?"nemoguce":to_string(ans));
}

컴파일 시 표준 에러 (stderr) 메시지

portal.cpp: In function 'int main()':
portal.cpp:78:27: warning: unused variable 't' [-Wunused-variable]
   78 |   int i=v.fi.fi,j=v.fi.se,t=v.se;
      |                           ^

• Subtask 1: 12 / 12
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 12 / 12
• Subtask 5: 0 / 12
• Subtask 6: 0 / 12
• Subtask 7: 0 / 12
• Subtask 8: 0 / 12
• Subtask 9: 0 / 12
• Subtask 10: 0 / 12