USACO 1.2 transform

/*ID:zizz-zi1LANG:CTASK:transform*/#include <stdio.h>#define MAXN 10typedef struct board board;struct board{int n;char a[MAXN][MAXN];};board whirl(board a){board b;b=a;   //这里貌似必须这样写int i,j;for(i=0;i<a.n;i++)for(j=0;j<a.n;j++){b.a[j][a.n-i-1]=a.a[i][j];}return b;}board mirror(board a){board b;int i,j;b=a;for(i=0;i<a.n;i++)for(j=0;j<a.n;j++){b.a[i][a.n-j-1]=a.a[i][j];}return b;}int check(board a,board b){int i,j;for(i=0;i<a.n;i++)for(j=0;j<a.n;j++){if(a.a[i][j]!=b.a[i][j]) return 0;}return 1;}int main(void){board whirl(board);board mirror(board);int i,j,n;board a,b;FILE *fin,*fout;fin=fopen("transform.in","r");fout=fopen("transform.out","w");fscanf(fin,"%d\n",&n);a.n=b.n=n;for(i=0;i<n;i++)fscanf(fin,"%s\n",&a.a[i]);for(i=0;i<n;i++)fscanf(fin,"%s\n",&b.a[i]);if (check(whirl(a),b)) fprintf(fout,"1\n");elseif(check(whirl(whirl(a)),b)) fprintf(fout,"2\n");elseif(check(whirl(whirl(whirl(a))),b)) fprintf(fout,"3\n");elseif(check(mirror(a),b)) fprintf(fout,"4\n");elseif(check(whirl(mirror(a)),b)||check(whirl(whirl(mirror(a))),b)||check(whirl(whirl(whirl(mirror(a)))),b)) fprintf(fout,"5\n");elseif(check(a,b)) fprintf(fout,"6\n");elsefprintf(fout,"7\n");fclose(fin);fclose(fout);return 0;}