如题:广度优先搜索
#include < stdio.h >
int hash[105][105];
typedef struct { int l, c; }type; type q[50000]; int head, tail;
int move[4][2] = { 0, 1, 1, 0, 0, -1, -1, 0 };
void inith( int n ) {
for ( int i=0; i<n; i++ ) { for ( int j=0; j<n; j++ ) { hash[i][j] = 0; } } }
void initq() {
head = 0; tail = -1; }
void inq( type *a ) { tail ++; q[tail].l = a->l; q[tail].c = a->c; }
void outq( type *a ) {
a->l = q[head].l; a->c = q[head].c; head ++; }
int testempty() {
if( head > tail ) { return 1; } return 0; }
int bfs( type *s, int cor, int n ) {
int ans = 0; int tl, tc; type a, b;
initq();
inq( s ); ans ++; hash[s->l][s->c] = -1;
while ( ! testempty() ) { outq( &a );
for ( int i=0; i<4; i++ ) { tl = a.l + move[i][0]; tc = a.c + move[i][1];
if ( tl>=0 && tl<n && tc>=0 && tc<n && hash[tl][tc]==cor ) { b.l = tl; b.c = tc; inq( &b ); ans ++; hash[tl][tc] = -1; } } }
return ans; }
int main() {
int n; char ch; type in; int i, j; while ( 1 ) { scanf( "%d%c", &n, &ch ); if ( n==0 ) { break; }
inith( n );
for ( i=0; i<n-1; i++ ) { for ( j=0; j<n; j++ ) { int x, y; scanf( "%d%d", &x, &y ); hash[x-1][y-1] = i + 1; }
}
for ( i=0; i<n; i++ ) { for ( j=0; j<n; j++ ) { if ( hash[i][j] != -1 ) { in.l = i; in. c = j; if ( bfs( &in, hash[i][j], n ) != n ) { break; } } } if ( j < n ) { break; } }
if ( i<n ) { printf( "wrong\n" ); } else { printf( "good\n" ); } } return 0; }
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