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上下左右4个变量 while(xh > xl && yh > yl){ int x, y; for(x=xl, y=yl; x<xh; x++) res.add(matrix[y][x]); for(x=xh-1, y=yl+1; y<yh; y++) res.add(matrix[y][x]); for(x=xh-2, y=yh-1; x>=xl && y>yl; x--) res.add(matrix[y][x]); for(x=xl, y=yh-2; y>yl && x<xh-1; y--) res.add(matrix[y][x]); xl++; xh--; yl++; yh--; }
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