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上下左右4个变量 while (left <= right) { // top for (int i = left; i <= right; i++) { matrix[top][i] = cnt; cnt++; } top++; // right for (int i = top; i <= bottom; i++) { matrix[i][right] = cnt; cnt++; } right--; // bottom for (int i = right; i >= left; i--) { matrix[bottom][i] = cnt; cnt++; } bottom--; // left; for (int i = bottom; i >= top; i--) { matrix[i][left] = cnt; cnt++; } left++; }
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