Submission #232070

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Source Code Expand

#include <cstdio>
#include <cstring>

#define rep(i,n) for(int i=0;i<(n);i++)

using namespace std;

const int dx[]={1,1,0,-1,-1,-1,0,1};
const int dy[]={0,-1,-1,-1,0,1,1,1};

int main(){
	int h,w; scanf("%d%d",&h,&w);
	char B[52][53];
	rep(i,h) scanf("%s",B[i+1]+1);
	rep(j,w+2) B[0][j]=B[h+1][j]='#';
	rep(i,h+2) B[i][0]=B[i][w+1]='#';
	h+=2;
	w+=2;

	int i0,j0;
	rep(i,h) rep(j,w) if(strchr("^v<>",B[i][j])) i0=i, j0=j;
	int dir0;
	if     (B[i0][j0]=='^') dir0=2;
	else if(B[i0][j0]=='v') dir0=6;
	else if(B[i0][j0]=='<') dir0=4;
	else                    dir0=0;
	B[i0][j0]='.';
	int hand0=(dir0+6)%8;

	bool vis[52][52]={};
	int i=i0,j=j0,dir=dir0,hand=hand0;
	rep(_,1000000){
		vis[i][j]=true;

		if(B[i][j]=='G'){
			int ans=0;
			rep(y,h) rep(x,w) if(vis[y][x]) ans++;
			printf("%d\n",ans);
			return 0;
		}

		if(B[i+dy[(dir+6)%8]][j+dx[(dir+6)%8]]!='#'){
			dir=(dir+6)%8;
			i+=dy[dir];
			j+=dx[dir];
			continue;
		}

		if(B[i+dy[dir]][j+dx[dir]]!='#'){
			i+=dy[dir];
			j+=dx[dir];
			continue;
		}

		dir=(dir+2)%8;
	}

	puts("-1");

	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:12: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result
./Main.cpp:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result

Judge Result